simplify and rename percentChance method
simplify and rename percentChance method

Elao/curvytron,Wohops/curvytron,lutangar/curvytron,coredump-ch/curvytron,Elao/curvytron-arcade,coredump-ch/curvytron,lutangar/curvytron,Curvytron/curvytron,Elao/curvytron,Curvytron/curvytron,Elao/curvytron-arcade,Wohops/curvytron,Curvytron/curvytron-arcade,Curvytron/curvytron-arcade