Cryptworld is an updated version of the old chill rules as written by pacesetter from the 1980s. The game system incorporates all the old supplemental rule material (creature feature) into a tight package and the game system is steamlined, balanced, and complete.
Also, Cryptworld runs easily due to the simplicity of the pacesetter action table, making this game compatible with Majus, Rotworld, TimeMaster, Star Ace, and the original (1st Edition) CHILL. And all their supplimental material.
Plus, Cryptworld lends itself well to DIY horror worlds and the authors provide good examples on how to create your own monster hunting societies. A wonderful toolbox and at a great price. Great job Goblinoid Games!