Silent Planet

In Silent Planet, players are tasked with forming teams of aliens, but they are not allowed to talk to each other in the vacuum of space. Therefore, they can only solve this task together by using their non-verbal communication skills.

Specifically, the game consists of 55 alien cards numbered from 1 to 5, with more 1s than 2s, more 2s than 3s, and so on. The game also includes nine Xs, which can represent any number. At the beginning of the game, you are dealt a hand of nine cards. Look at these cards, then lay them face down on the table in any order you wish, then reveal as many cards as you wish. These cards are now out of play, but you can (ideally) use them to convey information about what remains hidden in your row.

As a group, you try to form alien teams consisting of five cards representing the five numbers or five cards representing a single number. On each turn, all but one of the players collectively decide - without saying anything, but with whatever gestures they wish - which face-down card to reveal in the row of the player not participating in the debate. Once this card is revealed, it is placed in the center of the table. Then the next player in clockwise order sits down while all the other players decide which of their cards should be revealed and added to the team being formed.

If a card is added to a team that would break the team - for example, adding a 3 when the visible cards are 1 and 1, or adding a 2 when the visible cards are 1, 2 and 4 - all visible cards are removed from the game. X-cards have no fixed value, so you can consider them as having the value needed to keep a team valid. If you create a valid team of five cards, that's fine! Set it aside, then start a new team. If you can create as many teams as there are players at the table, you win; if you run out of cards and can't create enough teams, you lose.