〔→〕 Move right
〔←〕 Move left
〔↓〕 Soft drop
〔↑〕 Rotate right
A single-sided tetromino block piece, constructed by combining four squares, falls randomly from the upper part of the field, one type at a time.
When any 1 to 4 rows of the grid are completely filled with blocks, those rows disappear, and points are awarded based on the number of rows cleared. Clearing multiple rows simultaneously (up to 4 rows) results in higher points.