An O-Tetromino (Often called a square) is a tetromino arranged in a perfect square. If it is rotated, it does not change. It is always two blocks in length by two blocks in width. This piece is quite troublesome among others, and mainly because it cannot fit in any jagged areas in a player's matrix. However, in combos, they can be quite useful.
O-Block has a love for adventure and will always be exploring new places. O-block has a yandere level of love for J-block which he does not seem to reciprocate. O-block also has a nack for dagger throwing which some other Tetrominos think could be used against them.