Ozeango

Ozeango is a two-player only game inspired by chess. Two players use their six sea creatures in a 4x4 grid to try to capture the other player's animals and checkmate their Octopus. Once a player has captured an opponents animal, they can use it in their team. Each animal has a different way it can move around the grid.

—user summary

Checkmate the king of the deep sea.
Simple rules, sophisticated ways to play, animals with individual characteristics. If you capture an opponent's animal, you can reintroduce it as your own.
Includes 2 expansions.

—description from the publisher

The game comes with two bonus animals - the Dolphin and the Pufferfish - to add some variety to the game.