Cthulhu Dice is an odd little game. On one hand, it’s dramatically simple: each player has three sanity tokens. On your turn, choose another player, roll a die, and do whatever the die tells you (take sanity from the other player, lose sanity, etc.). If you’re targeted by another player, you get a free die roll in response. Continue until only one player has any sanity left, which usually takes about 10 minutes. That’s it.
The game so depends on die rolls that the only interesting mechanic over which players have any control is in choosing which other player to target. It quickly becomes a game of favoritism, leaving some players alone while ganging up on others. It also means the game is best played with groups of 4 or 5.
As a result, Cthulhu Dice can be an amusing diversion, a fun way to pass a little time with friends.
You can play a free online demo of the game.