Mystery Tower, previously known as The Tower of Babel (Babel no Tou) or just Babel, is an action puzzle game. The game consists of 64 "floors" or puzzles that involve the positioning of many L-shaped blocks. You must manipulate them to create stairs so you can reach the exit of each floor. Some floors are sealed, and you must collect crystal balls to escape. There are items to collect for bonus points, and a small number of enemies to avoid.

The game was a Japan-exclusive title up until its release on the Nintendo Switch Online service, finally receiving its current overseas title.