Atlas is an action-rpg with rogue-like elements where you use your ability to control the ground to fight the enemies and move through procedurally generated worlds.
There are several key differences in gameplay from the original Tetris. First, in addition to clearing lines, one can also form 4×4 large squares of four pieces to form blocks. When a block is created, it turns solid gold or silver, depending on the makeup of the block. Blocks can only be constructed from whole pieces: if any part of a piece has been cleared, then it cannot be used to form a block. When a line that has pieces from a block is cleared, it earns more points.
