Mojipittan is similar in play to the word gameScrabble. Taking turns against the computer or a human opponent, the player uses tiles with hiragana to build words, eventually building upon their opponent's tiles with words of their own. Unlike Scrabble, however, each player may place only one tile per turn as opposed to multiple tiles in the former. Tiles must be placed next to any other tile on the board, space permitting, but at least one word must be formed with each tile placed; as long as these conditions are met, a tile may be placed anywhere on the board, even if not all of the other tiles a new tile is connected to form new words.
A major difference in how the game plays in contrast with Scrabble is that words do not need to be isolated.
For example, in the play pictured above, with the bold letter う being played, in addition to つうか (either 通過 for "passing", or 通貨 for "currency"), つう (通, connoisseur) and うか (羽化, eclosion) qualify as words. The horizontal words that qualify in this play are ふつう (普通, "normal"), つうち (通知, "notification"), and うち (内 "inside"), as well as つう again.
On April 28, 2004, Namco released a modified version of Mojipittan called Xenopittan in their Xenosaga supplementary game Xenosaga Freaks in Japan. Xenopittan plays like Mojipittan but features characters and unique terminology from Xenosaga.