Skull King Card Game

Skull King is a trick-taking game similar to Oh Hell!, Wizard, Euchre and Spades, with players needing to state how many tricks they think they'll win each round. A unique element of this game is that bidding takes place simultaneously, leading to rounds that are sometimes over, or under-bid. As players must win the exact number of tricks that they bid to earn points, winning too many tricks is just as bad as winning too few and this leads to intense competition where losing a trick can be as exciting as winning one.
Skull King uses a 66-card deck that consists of five Escape cards, four suits numbered 1-13, two Mermaids, five Pirate cards, 1 Tigress card, and 1 Skull King card. The game lasts ten rounds, and in each round, each player is dealt as many cards as the number of the round. All players simultaneously bid on the number of tricks they think they'll take by holding out a fist and on the count of three revealing a certain number of fingers (or possibly a closed fist for a bid of zero tricks).