In between
Probably the cruelest most maddening game on the planet
Everybody throws in $5 into the pot, and then you start going around the table.
Dealer throws down 2 cards. You have to decide if the next card is "in between" those two. You can wager whatever portion of the pot you want. 1/4. Half. All. Even $2, which is what most will do.
If you pass, you have to throw a $1 into the pot regardless.
If you do wager, and a card comes up that is the exact same as one of the 2 cards that you are trying to "inbetween", then you have to double the wager that you made and put it into the pot. You can always wager what is in the pot.
Played a 4 man game in college one night. Ace/Deuce came up in a $750 pot. Guy potted it and the next card was an Ace. He ripped the door off his bathroom and punched a hole in the immediate wall.
Good times were had by all.