There are several key differences in gameplay from the original Tetris. First, in addition to clearing lines, one can also form 4x4 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—a block built from all the same kind of piece becomes a golden block or "monosquare", while any other combination becomes a silver block or "multisquare". 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.
Second, in order to aid in the planning of building blocks, the game shows three upcoming pieces and has a "storage area" where a spare piece can be stored. If the piece in the storage area is more desirable than the currently falling piece, the player can press the L button to swap the currently falling piece with the stored piece. One other feature is that the rotation is much more flexible than in traditional Tetris games, trying several slight nudges, which players have called "wall kicks", before finding one where the tetromino fits. Some of these compensations move the pieces away from walls even "over" other pieces. In fact, the game rewards players for performing these seemingly impossible "spin moves": If a line is cleared by doing a spin move, all the pieces above or below the spin move break apart into individual blocks and fall down, possibly clearing many lines and filling in empty spaces in the bottom portion of the play area. Unfortunately, the spin move process causes golden and silver blocks to become ordinary pieces again and so they no longer carry their multiplier when cleared.