At the climbing wall we use the same sort of idea for a game called "Add On". One person starts by picking a couple of starting holds and the first move. Every other person then adds one move to the sequence. When you can't go further, you drop out and the others continue until there's a winner. It definitely builds your ability to remember complex sequences in a stressful situation. The people who played the most were better at remembering the sequence than people who didn't play as often, *irregardless* of actual climbing ability. The ability to remember sequences seemed to translate into a greater ability to remember and figure out the best way to do outdoor climbing routes.