COSMOS is a board game categorized as trick-taking, where players navigate a « Collision (same rank card conflicting) » system to avoid claiming tricks, accompanied by elegant and stunning planetary artwork.

Each player takes turns playing one card from their hand. After everyone has played a card, the player who played the « Best Card (Highest Rank card among the cards with the Most Numerous Suits) » takes the trick.

the goal of the game is to take the fewest tricks each round. The game ends in the round where someone reaches a specific number of tricks, and the player with the fewest total tricks at that time is declared the winner.