Rensim, formerly known as Puyosim, is an Android puzzle game developed by haripo. It is an unofficial Puyo Puyo simulator that offers a variety of features. The game has two modes: Endless and Edit mode. In the Endless mode, the game goes on until the player loses, whereas in the Edit mode, the player can create and customize their own puzzles. The game also offers an Undo/Redo feature, which helps in correcting mistakes.

Additionally, Rensim offers a color-balance configuration feature, which allows players to adjust the color balance to their preference. The chain animation is another feature that adds to the overall gameplay experience. Finally, the game also allows players to export a snapshot and moves, which can be used to share their achievements with others.

Overall, Rensim is a fun and challenging game for puzzle enthusiasts. The variety of features and modes make it an engaging experience. The only downside is that it is an unofficial simulator, which means that some players may prefer an official version. However, if you don't mind that, then Rensim is definitely worth checking out.