So, been a GM for a while. the mutant ' undergångens arvstagare ' is a pretty simple system but both to simple and annoyingly complicated. its a D100 % system, You have skills and base stats ( the base stats are similar to DnD ), and you can either use the skills which is a flat rate of %. example. if you suck at firearms you might have 15% chance to fire it correctly ( you roll a D100 under that number ) and then the DM adds difficulty. But you can do it with stats to, then the gm (TBC 1/3)