The Maximum Mayhem modules are based on the OSRIC™ System (Old-school System Reference and Index Compilation) which is very similar to the first edition of Advanced Dungeons and Dragons or 1e. They can be easily adapted to any First Edition Style Fantasy RPG or OGL / OSR Style System, AD&D, D&D 2e to 5e, Pathfinder, DCC, D20 System, or any system you want to use.
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