Cthulhu Dice

Cthulhu Dice is a dice game released in 2010 by Steve Jackson Games. It is recommended for 2-6 players, and the play time can be anywhere from 5–10 minutes. The game includes a 12 sided die, 18 glass marbles, and a set of rules. Each player rolls the die to compete with other players to be the last sane person left.

Rules

Each player takes three glass marbles to represent sanity, and the rest of the tokens are set aside.
A person will cast the die, rolling it against another player, causing him/her to lose or gain sanity.

Signs

Cthulhu Dice uses many signs on the custom die that represent moves of the players. The signs are: Yellow Sign, Tentacle, Elder Sign, Cthulhu or an Eye of Horus. The signs used in Cthulhu Dice are famous glyphs from H. P. Lovecraft's Cthulhu Mythos.