Crystal Defenders was Square Enix’s first iPhone game. Originally a three-episode mobile phone tactical defense game, Crystal Defenders on iPhone was released as a single package with 300 stages.
Now, the game is on Android in the form of two episodes, Crystal Defenders W1 and W2. In the first episode, players learn game basics. W2 introduces Power Crystals, which allows for a more complex game system.
That accounts for nearly every known platform, as Crystal Defenders is also on WiiWare, Xbox Live Arcade and PlayStation Network. On Android, it costs $7.27 yen.