About Game ——————— Donut Hoop Stack Puzzle is 3D color sorting puzzle game. 1600+ levels. Sorting the 3D ring in stack with same color ring. How to play ? ———————— Pick a hoop and put on stack which contain same color ring on the top, or empty tube. Each stack contain Maximum 3, 4, 5 or 6 hoops. When all the hoops match with same color level done perfectly. You can also undo your last move. Features ————— Your strategic power will be improved. Easy to play, Hard the master. No time limits. Qualitative Animation, Graphics and Sounds. Simple & User friendly controls. Good effects & particles.