 The power origin classes include choices such as Mutant, Elite (super-trained normal), Sorcerer, and Mechanical.The game rules use standard "d20" skills with a large range of original "Feats", which in "Big Bang" include super powers and other abilities.The game is also notable for using "Negative Feats", which functioned as disadvantages for a character, allowing more "Feats" to be chosen as a balance to defects.