FOMO3D Arbitrum is a game in which the grand prize winner is the last person to purchase a key before the countdown timer runs down to zero. During a round, people can purchase 1 or more keys, which adds time to the countdown and marks them as the current "exit scammer". With each key purchase during the round, the key price increases slightly, as does the pot. Players receive a stream of passive income from the game as keys are bought during the round.

The protocol's token is called Proof of Strong Hands 4D, an homage to the original Proof of Weak Hands 3D.