Ring classification of many colors in which you need to create a stack using rings of different colors. Have fun creating stacks with hoops by playing this game for free! Challenge your brain. - Only one ring can be moved at a time. Sort Stack Color Hoop Game,brain puzzle game,stacking game,color matching game,arcade game,puzzle game,casual game,brain training,hot game,hypercasual game,mobile game,ring stacking,color sorting,challenge your brain,free to play,Unity3D game,3D Games,Action,Adventure,Arcade,Brain,Bubble Shooter,Casual,Fun,Funny,Stack,Sports