Sakana Stack is a climbing/shedding card game in which players play stacks of seafood from their hand with the aim of having the most valuable stack in play.

Stacks can be played of matching numbers, but they must match the last played card by suit or number. Players score the top card from their stack if the next player passes, so the bigger the stack, the higher the scoring opportunity. Play continues until a player sheds all cards in their hand, or the draw pile runs out twice and all cards scored are counted and recorded. Play a number of rounds equal to the number of players to determine the most successful market vendor.