Sort Stack is a free puzzle game developed by Vnstart LLC for Android devices. The game features a stack of rings of different colors that players need to sort and stack on top of each other.

The objective of the game is to create a stack of rings of the same color. Only one ring can be moved at a time, and moves consist of taking the upper ring from one of the stacks and placing it on top of another stack.

Sort Stack is a new and addictive game that is easy to play but hard to master. It offers unlimited gameplay with 2000 puzzles and more to be added. Players can also choose from a variety of ring types and backgrounds.

One of the best features of Sort Stack is that it does not limit time and does not require a network connection. It's a great game for anyone who loves puzzles and wants to challenge their brain. Hoop Stack will keep you hooked for hours!