In Colossal Arena there is a group of eight creatures that are fighting. Each round, one of the creatures will die. To decide which unlucky sod will be the victim, players put numbered power cards in front of the creatures, with the lowest one going the way of the dodo. But what makes this game interesting at all is that players can make five bets throughout the game which will sometimes allow them to use a creature's special power and gives the game a method of scoring at the end.
This is a simple, light game of bidding and gladiatorial combat. Each player is given a set of tokens to use for bidding and a handful of cards. 8 out of the 12 warriors are chosen at the start of the game, and players represent financial backers. Each turn the players may place their token on a warrior who is still fighting and does not yet have a token in that round. Then a player plays a card; the cards represent the warriors and have a number. When all the active warriors have a card on the table the round ends and the warrior with the lowest number is eliminated, then a new round begins. At the end of 5 rounds the tokens of e remaining warriors are tallied, earlier tokens being worth more, and a winner is declared.