Two trails run through one shuffled deck. You and the dealer each start on one of the
numbered cards — pick one, or leave it to chance. From there a trail hops forward: the
value of the card it lands on says how many cards to move. In a line, a trail is over when
a hop passes the last card; in a loop it wraps around. Deal, watch where the two trails
finish, and tap any numbered card to light up its own trail. Once you've dealt a while,
type data for a running summary of your games. Spoilers: this paper by James Grime.