Thom Forbes

This game is dealt as a normal, run-of-the-mill seven stud, high/low game. And, at the start, that is the game to play. But, as the name implies, there is a hitch. 

If and when an ace is dealt "up," the last player in the round to get the "up" ace may change the game to any seven stud game we normally play in our game, meaning Woolworth, Baseball, Sevens Wild, Low Ball, etc. This is the rules in play for all four rounds that the card is dealt up. Thus, the game can conceivably be switched four different times. 

At the conclusion of each round the players bet, completing the game with the last down card, bet-declare-bet. 

Exception to the rules: If the game has been switched to Woolworth, it would mean the addition of a final spit after the deal has been completed prior to bet-declare-bet. —Geoff Shlaes