from The System:
This game uses a very simple dice + stat system. When you feel it is necessary to roll dice, simply choose which one of the two stats (Brains or savagery) is most applicable, have the player roll a d100 and add their stat. Higher is better. You may assign any given task a difficulty number, meaning that the player must get equal to or higher than that number to succeed, or you may simply apply a 'higher is better' approach, knowing that 300 is the absolute maximum possible.
This is a custom system used in the Kapcon Scenario of the same name.