くくまる (Kukumaru) is a game where players aim to get 6 of their discs in a row. The discs are hollow cardboard rings that are red on one side and blue on the other. The game has two modes: a "reflexes" real-time game and a "thinking" game. In both, players use a deck of number cards to generate multiplication products that determines where the player puts a disc in a 6x6 grid of numbers. In both games, the first player to get 6 in a row wins; if neither player achieves this when the cards run out, the player with more of their discs on the board wins. The game includes a few variants, including one that adds Othello/Reversi rules.

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