Maze Torus Puzzle HanaWon

Path finding game in Maze Torus. Intersection of two Green rings are blocks. Purple circle can't cross the intersection of two Green rings. White/Grey/Black rings in the intersection change colours when purple circle cross: (1) If the other is Green, then White-->Grey-->Black in order. (2) If both colours are same, then Black-->Grey-->White in order. (3) If both are White, then two rings disappear.i.e. {White, green} --> {Grey, green}, {Grey,green}-->{Black,green}.{Black,Black}-->{Grey,Grey}, {Grey, Grey}--> {White, White}.Goal.Remove all Black,Grey and White rings.Features.1. One button to start (in the bottom left corner) - Click anytime to start new.2. Eight buttons for menu - Select level.3. Two buttons for directions - up-left and up-right.