Chuzzle is unique for its range of modes. "Zen Mode" offers an endless, pressure-free experience, but the game is perhaps best remembered for "Challenge Mode" and the dreaded "Locks."

: These 2x2 furballs appear when you clear a 2x2 space. They are heavier to move, shifting two rows or columns at once.

The game’s chaos is anchored by its special pieces. The "Fat Chuzzle"—a larger version of the standard creature created by matching four in a row—is a brilliant subversion of the "clear the board" objective. When matched, the Fat Chuzzle explodes, shaking the screen and clearing a 3x3 radius.