Show the slide to review the rules of the game with the class.
Open a round by ringing the bell. Teams blindly trade at least one and as many as four cards with another team (one for one, two for two, and so on). To trade two cards, the team pulls out the two cards from their hand and shouts “Two cells! Two cells!” Team members then listen and look for another team looking to trade two cards. Traded cards must be the same suit (all Br, all S, all M, all H, all V, or all Bl) and the same in number (1, 2, 3, or 4 cards). They keep shouting the numbers they want to trade until the cards are exchanged, face down, WITHOUT revealing the cards, i.e. until they are in the new team’s hands.
Teams do not take turns (see “Slower version” below for alternative). Instead, everyone plays at the same time, trading with other teams until one team collects all the cards in a suit. When a team acquires a full hand of nine matching cards, they ring the bell and place the organ on the board at the front of the classroom. The game ends when one half of the class first organizes three organs within one color—that is, all three gold suits of the Nervous System: Br, S, M; OR all three red suits of the Cardiovascular System: H, V, Bl.
Have students play a quick round (about 5 minutes) while you monitor their understanding of the rules. Teams may mistakenly try one of these rule-breaking moves:
- trading different numbers of cards (like two cards for three cards)
- trading heterogeneous sets (containing more than one kind of suit)
- revealing what they are trading (in words or by flashing the cards to the other team)
- calling "Three! Three!" as in the original Pit game, rather than "Tissue! Tissue!"
When a team matches all 9 cards into three sets of "ti-ss-ue" cards, the team rings the bell and puts their organ on the board. When all three organs from that system are claimed, the system wins and that half of the class wins.