Hop on board the good ship Tranquility and set sail for paradise. Take care, though, because in a realm where the day blends into night it's easy to lose track of time and you still need to find that special little island to call home.

Tranquility is a co-operative card game where players must fill the sea with islands — specifically island cards with numbers on them — and guide the ship home before any player runs out of cards. Note that in the realm of Tranquility, the only way to play is in silence.

The goal of the game is for the team to finish the grid before any player runs out of available actions. Cards have to be placed so that the grid ascends in numerical order from bottom left to top right. All players win if they manage to complete the grid and have placed a Start and Finish card. All players lose if a single player is unable to play or discard any cards legally following the instructions given below. The players must not, however, communicate.

Play is taken in turns going clockwise with the quietest player going first. On a player’s turn they have to do one of the following: 1. Play a card or 2. Discard two cards. They then must draw back up to a hand of five cards. Cards must be placed so that the grid increases in numerical order from bottom left to top right. If the card is put next to an existing card in the sequence then they must discard cards from their hand equal to the difference between the numbers face down in front of them e.g. placing a 5 next to a 3 will require two cards to be discarded from their hand. This will apply even if the cards are on different rows.