Hoop Stack is a new ring sorting puzzle game developed by Fun World Games for Android devices. The game offers a unique concept in the sorting puzzle genre with colored hoops. The objective of the game is to match all the rings with the same color into the stacks.

The gameplay is simple, pick a ring and put it into the stack by dragging or tapping. Only one ring can be moved at a time, and the hoop can only move on top of the same color hoop or an empty pole. The game features multiple backgrounds and hoops, with no time limits and free to play. There are 9000+ challenging levels to keep you entertained for hours. You can use the undo, add a pole, or skip level options if you get stuck. The game is addictive and perfect for exercising your brain.