We played Craps. Instead of numbers on the table, we taped the name of PNMs to the square. The Rush Chairman shot the dice as the chapter cheered on their square. The Chapter President was the "stickman"
In Gamma Phi Beta, we have "PNM Tokens" which are basically poker chips with the girls' numbers on them. Then, we have a wooden box with a slot at the top. At the end of each night, we flip the tokens at the box - the ones that fall into the slot are eliminated. That's what we mean when we say that "sometimes girls fall through the cracks".