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The MAYHEM Battle Chest edition contains both the core rules and the STRONGHOLD expansion.

MAYHEM is a 'fantasy mass battle' combat game played on the grand scale. Here generals lead armies of their own creation on the field of battle in search of victory and glory. Not just for wargamers, MAYHEM is perfect for roleplayers looking to integrate a customizable set of mass combat rules into their campaigns and adventures.

Core game features overview:

  • custom points based army construction
  • uses d4, d6, d8, d10, d12, and d20 dice
  • rules for war machines
  • sorcery system featuring spells like blink, magic missile, summons, and time stop
  • VERSUS game engine [including Deadlocks and Overdrive]
  • play at any scale including 6mm, 10mm, 15mm, and 28mm
  • players can use armies based for other systems
  • no casualty removal
  • includes quick reference sheets, army construction worksheet, and General’s Compendium
  • official support from popular miniature manufacturers

MAYHEM gives you complete control over building your army from the ground up. After creating core profiles and heroes, you have over 60 options at your disposal that can be used equip and upgrade. These include unit designations, weapons, armor, standards, traits, abilities, and gear.

The VERSUS game engine layers mechanics and interactions in such a way as to provide a truly innovative and unique gaming experience. To begin with, stats in the game are not based on fixed numbers but on die types instead. Anytime that you are called upon to roll dice, you may instead choose to take the default; this is equal to half the value of the die. This choice of risk versus reward is behind every decision in the game.  These die types can be improved in steps depending on which weapons a unit is equipped with and what type of unit it is combating. This system of soft and hard counters means no complicated tables or stat lines are needed, yet it rewards the application of both tactics and strategy.

The game can be played at any scale, and players may use armies already based for other popular mass battle systems. Speaking of basing, there is no individual casualty removal in the game so hobbyists are free to make each unit a mini diorama. And, after you've mastered the basics of battle, the STRONGHOLD expansion awaits!

The STRONGHOLD expansion includes rules for:

  • advanced terrain options including the garrisoning, attacking, and burning of structures
  • new designations like scout, skirmisher, and heroic skirmisher
  • heroes to engage one another in epic challenges
  • battle sorcerers that can focus their magical powers to control hulking mechanical constructs or harness the fury of bound behemoths
  • new spells, traits, abilities, and gear
  • building your own strongholds and keeps including over 15 upgrades to create the ultimate fortress
  • siege engines and laying siege to enemy strongholds and keeps
  • new scenarios including border keeps and a unique mass battle multiplayer mode
  • campaigns and linked games with unit progression, multiple paths to victory, and seasonal weather effects

The expansion has been set-up as a toolbox that will allow you to pick and choose the rules that best fit your group and the gaming experience you're looking for. It also means that the core rules will grow and evolve along with your tactical and strategic abilities.

The download includes the General’s Compendium. This is a living document that gives would-be generals example unit profiles, advice on tactics and army building, and designer’s notes, musings, and meta-game discussions. This document will be updated periodically and be used as a FAQ as needed.

The MAYHEM core rules are found on pages 1-26 with the STRONGHOLD expansion on pages 27-44. The PDF version of the rules are fully bookmarked and searchable.

Have fun storming the castle!

MAYHEM is officially supported by some great partners including Demonworld, Eureka, Litko, Microworld, Pendraken, and Rebel Minis.

MAYHEM-BrentSpivey-fantsy-mass-battle

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Reviews (5)
Discussions (23)
Customer avatar
Pablo O June 11, 2025 4:04 pm UTC
PURCHASER
Hello, I have a question: Could the MAYHEM rules be adapted into a space fantasy setting? I so, how do you recomend would it be like? Also, I am curious if they could be adapted into a naval and/or space battle wargame?
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Customer avatar
Brent S June 12, 2025 4:43 pm UTC
PUBLISHER
I could!

If you're thinking of something like Epic 40K, then the basing, weapon ranges, and unit interactions work really well due to the scale. It would mostly just be renaming the units/weapons/abilities for a homebrew game. The same goes for space and/or naval battles.
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Customer avatar
Pablo O June 12, 2025 7:32 pm UTC
PURCHASER
I expected such a case in land sci-fi battles, but perhaps further detail on how the rules could be adapted into a naval or space battle scenario would be ideal. Also, as I said before, I liked your rules and thus will use for my custom fantasy setting: an extension of this would be the same setting but further down the timeline with the base setting factions having been able to reach and travel through space, so aid in how to adapt the MAYHEM rules to fit these other niches of wargaming is appreciated. As before, thanks for the early reply.
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Customer avatar
Brent S June 13, 2025 5:13 pm UTC
PUBLISHER
For naval/space battles, you might play around with the concepts of drift, inertia, and momentum. You could add a d6 forward roll to all movement that's performed via Overdrive, and add a d4 side movement roll when a unit changes facing.
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Customer avatar
Pablo O June 13, 2025 7:20 pm UTC
PURCHASER
Just that? What about weaponry and/or fighting usage, or different classes of vessels? Boarding actions should be easy to adapt, since I see them working in the same way as standard Mayhem melee combat, but other things such as traits and such become harder to visualize. Still, those suggestions are nice to consider.
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Customer avatar
Ken F June 13, 2025 7:50 pm UTC
PURCHASER
I have been following this conversation with interest and thought I would offer my opinions as someone who has played Mayhem many times, and all manner of other miniature games. While I agree Mayhem is a fantastic game, and its core mechanics are great, I would argue the focus and scope of it is far different from what I envision a sci fi or naval game to be. Mayhem focuses largely on melee combat with the game pieces in physical contact with each other, with only a smattering of shooting, while sci fi and naval games (to my mind) focus very heavily on shooting at a distance, with only limited close in "melee" actions where the game pieces would be in contact with each other. One could very easily use the great core Mayhem mechanics, but to make it feel sci fi or naval would require, I feel, layering on top of those an entirely separate framework of rules.
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Customer avatar
Pablo O June 13, 2025 10:02 pm UTC
PURCHASER
I agree with this to a great degree.
Customer avatar
Pablo O June 03, 2025 2:06 pm UTC
PURCHASER
Hello, I really liked the game system, to the point of wanting to use it for my own custom miniature wargame. Is there a problem with that?
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Customer avatar
Brent S June 05, 2025 6:02 pm UTC
PUBLISHER
Hi Pablo!

If you talking about using the system to create your own custom version of the game for personal use, there's definitely no problem with that. I only ask that you don't share, sell, or distribute it.

If you do use it to create your own custom system/mod/house rules for the game and think it looks like it would be a cool add on, contact me, and we can look at adding it as a download to MAYHEM. I did that with the house rules and a scenario generator created by Thibault Bloch for ROGUE PLANET and people really seemed to enjoy it!
https://www.wargamevault.com/product/139359/Rogue-Planet

Thanks again for reaching out, and I'm excited that the system has motivated you to create something! :)
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Customer avatar
Pablo O June 08, 2025 1:58 pm UTC
PURCHASER
Thanks for the reply, but I still have a further inquiry: when talking about sharing, selling, or distributing this custom version of Mayhem, do you refer only to the rules or also to any additional products derived from it, such as miniatures for the specific units of the game or lore documents of this custom setting of mine that would use Mayhem for its wargaming rules?
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Customer avatar
Brent S June 08, 2025 5:08 pm UTC
PUBLISHER
I'm referring to the rules.

So, if you wanted to make units, lore, a custom setting, or another type a source book/add on, that's great as long as it still requires the core rules to play and isn't a reworking/retheme/mod of the core system. You could even add this line in the front matter of the book/document: Requires MAYHEM: Fantasy Mass Battles core rules by Brent Spivey for play.

Hope that helps, and thanks for reaching out for clarification!
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Customer avatar
Pablo O June 09, 2025 12:20 am UTC
PURCHASER
I see, thank you for the quick reply.
Customer avatar
Alex S May 24, 2025 5:04 pm UTC
PURCHASER
Hello! Really enjoying this game. Two quick questions: 1) is there any way to get the preconfigured army lists in a format other than battlescribe? 2) Do you have to pay the cost for a general's move, CQ, BAR as normal? I was confused because of how the general doesn't seem to directly fight? Thanks in advance!
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Customer avatar
Brent S May 25, 2025 2:29 pm UTC
PUBLISHER
Hi! Glad you’re having fun!!
1) Sorry, but not at this time.
2) Yes, you have to pay for all of the characteristics as they come into play if your General chooses or is forced to join a unit. Additionally, movement is particularly important for maximizing your command range, avoiding enemy units, and positioning yourself to maximize spell effects (if your General happens to be a Sorcerer).

Hope that helps!
Customer avatar
Elia C July 29, 2023 3:08 am UTC
Would it be possible to adapt these rules to a hex based map?
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Customer avatar
Brent S July 29, 2023 5:39 pm UTC
PUBLISHER
Hi Elia!

It would. You would need to:
- change the measurements from inches/centimeters to hexes
- determine facing for the units

For the facing, it would be easiest to have one side of the hex be the front, the opposite side be the rear, and the 4 remaining sides be the flanks.

Other than that, you wouldn't need to do much of anything at all. Hexes would actually make some of the content in the Stronghold Expansion (which is included) easier to implement and give it an Age of Wonders/Planetfall vibe.
Customer avatar
Adam K September 14, 2021 9:35 pm UTC
PURCHASER
When cavalry fights against unit with swords, does sword get soft counter against cavalry ? And why only 3 proiles for large units?
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Customer avatar
Brent S September 15, 2021 7:24 pm UTC
PUBLISHER
Swords are only a soft counter against units with the infantry trait. So, they would not get the counter against the cavalry in your example.

Monstrous Creatures were limited to 3 profiles as those seemed to cover the vast majority of miniatures that would fall into that size category without introducing a bunch of special rules or shifting the balance of the game. If a model/miniature doesn't easily work with one of those profiles, the Behemoth designation combined with appropriate traits and abilities will usually get the job done.

I hope that helps!
Customer avatar
Adam K July 19, 2021 10:04 pm UTC
PURCHASER
One question, if I want rules for 28mm fantasy Mayhem or Havoc ?
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Customer avatar
Brent S July 20, 2021 9:58 am UTC
PUBLISHER
Mayhem gives you more flexibility and will let you do mass battle or skirmish. If looking to do mass battle only, then you definitely want Mayhem. This blog post has some great examples of using it for skirmish: http://baronvonj.blogspot.com/2014/07/mayhem-mass-battle-system-as-skirmish.html

Havoc is more of a "skirmish +" system. The focus is on smaller model counts and uses the concept of organic formations to allow for a zoomed in view of the action on the battlefield. This excellent battle report will give you a great feel for how it plays: http://teasgettingcold.blogspot.com/2010/08/ghoul-interrupted-report.html

The two systems are very different mechanically. Also, when constructing forces, Mayhem has more detailed and specific options for building your troops. Havoc uses more generic high level concepts for troop types.

Let me know if you have any other questions!
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Customer avatar
Adam K July 20, 2021 8:20 pm UTC
PURCHASER
Mayhem in 28mm do I need square bases or can use round ?
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Customer avatar
Brent S July 21, 2021 12:39 pm UTC
PUBLISHER
If you're going to use the rules for skirmish gaming, then you can use either. Round bases will work best for skirmish battles though as they make all the interactions between models cleaner.

Square bases work best for battle. If you're building your armies from scratch, I recommend doing vignette style basing where all of the models are arranged thematically in little micro scenes on a larger base since there are no casualty removal rules for individual models in Mayhem. Here are a couple of examples of the kind of basing I'm talking about:
- http://baronvonj.blogspot.com/2014/03/mayhem-20.html
- http://3.bp.blogspot.com/_aTKdG314pHI/TTv50Ku5X_I/AAAAAAAACPc/3IrPuTL2YJs/s1600/P1220012.JPG
Customer avatar
Hugh B April 04, 2021 7:58 pm UTC
PURCHASER
Hi Brent
In Battlescribe I note that Dwarves are described as "Hardened" and that that means they roll an extra die for BAR but I can find no reference to it or its cost in the rules.
Please can you tell me where I'll find it.
Thanks
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Customer avatar
Brent S April 05, 2021 9:36 am UTC
PUBLISHER
Hi Hugh!

You won't find it in the rule book. It's a bonus themed ability for the Dwarves that's only found in the Armies of Mayhem BattleScribe files.
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Customer avatar
Hugh B April 05, 2021 12:14 pm UTC
PURCHASER
Ah, that explains it! :)

Just in case I want to use them in my own army creations:-
1. Can you confirm the cost for the ability?
2. And are there any other abilities exclusively in the Battelscribe files?
Reply
Customer avatar
Brent S April 06, 2021 9:38 am UTC
PUBLISHER
1. Hardened is one of those abilities that the pricing changes depending on what you do with the other stats and units. That's not an issue for pre-built lists, but it makes balancing it for open army building nearly impossible. If you're not overly concerned with balance, you could use a cost of 6 Crowns. That will work if you don't try to do anything too crazy.

2. There might be a few others hidden away in there. ;)
Customer avatar
louis R January 19, 2021 9:58 pm UTC
PURCHASER
I'm having trouble understanding the difference between a base vs unit vs model vs profile. Can you explain?
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Customer avatar
Brent S January 20, 2021 10:40 am UTC
PUBLISHER
Absolutely!

Bases refers to the physical base that a unit/models are mounted on. An example would be a 40mm x 40mm base.

The terms unit/model can mostly be used interchangeably. This refers to a model, or group of models, mounted on a single base.

A profile is the combination of designations, stats, traits, abilities, and gear that define a unit/model.

Customer avatar
Ken F January 04, 2021 5:08 pm UTC
PURCHASER
I'm starting to have a look at this game again. I had a hard time when I first purchased it getting people at my FLGS into the game. This was mostly because they already get their fantasy miniatures fix from playing the owner's home-brew game, but also in part because I want to play Mayhem in 15mm, which seemed to be a big turn off to them. A real shame on both parts because they wouldn't even give the game a try. Time perhaps to try again.

Anyways, one quick question if I may. When it says that skirmishers, "may move freely in any direction", does that mean they ignore the edges of their base and can move however they wish, even diagonally? Or does it mean they do not pay extra Cp to move to their flanks or rear?
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Customer avatar
Ken F January 04, 2021 5:35 pm UTC
PURCHASER
Just came up with another question while reading through skirmishers. Skirmishers that become engaged by enemy non-skirmishers are immediately eliminated (ignoring for the time being heroic skirmishers and garrisoned skirmishers). Can I as the skirmisher however, engage enemy non-skirmishers without being eliminated? Or am I reading that wrong and it should be no matter how a skirmisher becomes engaged with a non-skirmisher it is immediately eliminated?
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Customer avatar
Brent S January 05, 2021 2:33 am UTC
PUBLISHER
Skirmishers are treated as having front facing on all sides and may move freely in any direction. So, they don't have to pay any additional costs for moving to the flanks or rear. You do still have to pay attention to the edges of the bases.

If a skirmishing unit becomes engaged with an enemy non-skirmishing unit, it is eliminated no matter which unit initiated the contact.
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Customer avatar
Ken F January 05, 2021 6:08 pm UTC
PURCHASER
Excellent. Thank you. May I suggest that in future re-writes the wording be changed since they cannot move in "any direction", which implies the full 360 deg around its base, but instead can move to "any face". Heroes on circular bases are the only ones that can in fact move in "any direction" (if I understand things correctly now).
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Customer avatar
Brent S January 06, 2021 10:34 am UTC
PUBLISHER
My pleasure!

That's a great suggestion too, and I'll definitely make use of it in any future re-writes.
Customer avatar
Randy S December 09, 2020 8:39 am UTC
PURCHASER
I don't seem to be able to import the .bsr data into the iOS Battlescribe app. I've synced with Dropbox, but the app can't find the files. What am I doing wrong?
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Customer avatar
Brent S December 09, 2020 6:00 pm UTC
PUBLISHER
There are a couple of options that should work on iOS.

1. You can email the BSR file to yourself, and click the attachment. BattleScribe should appear as an option to open the file with. This is probably the easiest way.

2. To use Dropbox, link BattleScribe to Dropbox via the Manage Data screen. On your Mac, go to .../Dropbox/Apps/BattleScribe/data. Create a folder here, and place all the gst/gstz and cat/catz files in it.

Let me know if neither of those work for you.
Customer avatar
May K November 19, 2020 7:17 pm UTC
PURCHASER
When I open Battlescribe I don't find any Mayhem data and when I try to add it I'm asked for a URL. How do I get the Mayhem data into Battlescribe?
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Customer avatar
Brent S November 19, 2020 7:54 pm UTC
PUBLISHER
Hi May!

First select "update data", next select "import data", and then select "import data from file". You'll then import the Mayhem BattleScribe data from your computer.

If you have any issues, don't hesitate to let me know.
Customer avatar
Antonio S November 06, 2020 1:35 pm UTC
PURCHASER
Hello!
I am going through your rules and I am finding them amazing.

Just have a few doubts (but likely will have many more others, sorry about that):

- The Advance move:
It only says they have to be friendly units in direct base contact and squared up and that they perform a forward movement.
- Can they be units with different profiles?
- If they have different MOV, will they lose coherence at the end of the Advance?

- Squaring up:
Let's say I have unit A and I want it to square up with unit B so that they can advance together.
My options are:
- Forward movement from A into B's back
- Lateral movement from A into B's side
- Backward movement from A into B's front
Other options would result, even if squared up, in units having different facing and thus needing a reform before Advance. Is that right?

- Standing Order
If a group of units have a standing order, at the start of...See more
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Customer avatar
Brent S November 06, 2020 2:24 pm UTC
PUBLISHER
Hi Antonio! I'm glad that you're enjoying the rules.

- the Advance move
They could be different profiles. And yes, assuming the units had varying MOV stats, they would lose coherence at the end of the movement since all units have to move their default value.

- Squaring Up
All of the options you listed would work. Other options wouldn't necessarily result in units having different facing. For example, if unit A is facing north and is located to the east and northeast of unit B (meaning in front of unit B and to the right). If unit B was facing northeast and moved forward and right into contact with the left flank of unit A, then squaring up would allow the sides of the units to "click together". This is a pretty common way to get units into formation with one another.

- Standing Order
Correct. You can't cancel a standing order at the start of the turn. You must resolve the orders following the Command Roll. If a group of units is under a Standing...See more
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Customer avatar
Antonio S November 06, 2020 3:12 pm UTC
PURCHASER
Thanks a lot for the quick answer! That's great level of support!

I have two follow-ups:

Squaring Up:
In your example the front facing of B would meet the left facing of A. So shouldn't B end up facing East? "the leading edge must be squared up when making contact". Or does it depend from the angle?

Standing order:
So if I have a group of three units side by side and I give an order to the middle one.. the other two keep going if they would no longer advance together.
Reply
Customer avatar
Brent S November 06, 2020 3:44 pm UTC
PUBLISHER
My pleasure!

Squaring Up: it would depend on the angle. Just use your best judgement in that situation. It'll usually be fairly obvious on the table which makes most sense based on the approach.

Standing Order: in that example, they wouldn't be touching/squared up, so they would no longer be able to perform an Advance on the next turn.
Customer avatar
George Z January 28, 2020 7:32 am UTC
PURCHASER
Maybe this is just me, but I have had the hardest time reading through the rules. It's really difficult for me to flip from page to page trying to find answers to questions. Can ranged units fire a ranged weapon when engaged in melee combat? Flipping from melee, to harm, to ranged, then to combat effects seemed backwards. Why not put melee and ranged together, then harm and effects? Without an appendix I was lost.
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Customer avatar
Brent S January 28, 2020 9:41 pm UTC
PUBLISHER
Sorry about that George! Let's see if I can answer your questions.

Q: Can ranged units fire a ranged weapon when engaged in melee combat?
A: Only Monstrous Creatures can make ranged attacks while engaged in melee.

Q: Why not put melee and ranged together, then harm and effects?
The thought was that since the rules for melee end with causing harm, it would make sense to detail those on the opposite page. This keeps the reader from having to flip forward through the rules to find out how to resolve that. And since the rules for ranged attacks are on the very next page, and the rules for harm are the same for both, you could continue learning the ins-and-outs of combat with all the information sandwiched in one convenient place. That was the intent anyway. Once again, sorry that the flow of information didn't work for you.

Let me know if there's anything else I can do to help you get these rules to the table! I think you'll have a good time with them when you do....See more
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Customer avatar
George Z January 28, 2020 11:55 pm UTC
PURCHASER
Thank you for the response, I really appreciate it. It was late so I think the frustration was in part due to me being tired! I have reread the rules and feel a bit better after noticing the little things that I missed while playing. I think the most helpful thing for me is making my own reference sheet which has forced me to pay close attention to the rules. I know that you have one included, but this is more of an exercise for me.

I think I understand what you mean by placing all of the rules in their respective locations. The more I read the more I understand the flow.
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Customer avatar
Brent S January 29, 2020 2:50 am UTC
PUBLISHER
Awesome! Don't hesitate to reach out if you have any other questions.
Customer avatar
Angel S April 04, 2019 9:29 am UTC
PURCHASER
I've got a couple of questions:
The upgrade to General is free. But do you need to purchase the hero upgrade for him?

Also, the Leadership cost only affects the cost of standars? I don't believe you'd have to add it too to the unit profiles.
Reply
Customer avatar
Brent S April 04, 2019 7:48 pm UTC
PUBLISHER
Hi Angel!

No need to pay for the upgrade. The General is already a hero.

You are correct on the Leadership pricing. It determines the cost of adding standards to your units and which type of die you will use on Command Rolls.
Customer avatar
Peter L May 02, 2018 8:11 pm UTC
PURCHASER
Quick question: While Heavy Armor and Behemoth don't seem to be exclusive, Behemoths operate under different damage rules then units so heavy armor wouldn't seem to do anything for them. Was Heavy Armor ever meant to do anything for them, or are Behemoths just supposed to represent creatures so freakishly tough on their own that slapping some iron plates on them would just be gilding the lily?
Reply
Customer avatar
Brent S May 03, 2018 12:25 am UTC
PUBLISHER
You have it right! Heavy Armor doesn't do anything for Behemoths.

However, you can still show the effects of armor modeled onto a Behemoth in your army if you want to. Let's say that you have two trolls in your force, and one of them is heavily armored while the other is not. I would begin by making all of their characteristic values the same. They're both trolls after all- right? Next, I would increase the BAR of the heavily armored one to what seems like a level that would match the effectiveness of the armor. This is an easy way to show the armored troll is much more resistant to being harmed at range.
Customer avatar
Mihael S October 05, 2017 8:20 am UTC
PURCHASER
Does Mayhem have any specific basing conventions?
Could you please post them?

I would just like to know before i buy...
Reply
Customer avatar
Brent S October 06, 2017 2:47 am UTC
PUBLISHER
There are no required basing conventions. The recommend base sizes are:

- 40mm squares for 6-10mm miniatures
- 50mm squares for 15mm miniatures
- 60mm squares for 28mm miniatures

However, it you already have miniatures based for Warmaster, Warhammer, DBA, or HotT, they will work great!
Reply
Customer avatar
Mihael S October 10, 2017 10:58 am UTC
PURCHASER
Thanks for the reply :)
my dbm bases wll fit in nicely!

I just have a small request for you: how would a unit profile for some (dark ages) irish javelinman look?
Reply
Customer avatar
Brent S October 13, 2017 12:59 pm UTC
PUBLISHER
Perfect!

For the Dark Age Irish Javelinmen, I would probably start with something like this:

Javelinmen
MOV d6
CQ d10
BAR d10
Javelin [use the blowgun profile]
Shield

You could then consider improving the the MOV or CQ by a die type depending on what other units in the game look like.
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