Mana² (read: mana squared) is a puzzle game with RPG elements mixed in that's also fun in a multi-player environment.
The game plays pretty much like any "connect-four-of-the-same-colored-block" types of games like PuyoPuyo, Dr.Robotniks Mean Bean Machine and Kirby's Avalanch for example, but is specifically designed to be fun multi-player for more than two players.
It features game modes like Versus, Free for All, Team Versus, but also Solo game-modes, Story Mode and several others. This all together makes a puzzle game that's fun and addictive to play alone or with friends, or even just to pass some time.