Hi-Lo
A card is showing. Call the next one higher or lower; the longer the odds, the more it pays.
How to play
A single card is dealt face up from a 52-card deck. Call whether the next card will be higher or lower than the one showing. Aces are high. If the next card matches the rank exactly, the call loses.
The payout is set by the true odds of the call: the fewer cards on your side, the more the call pays. Calling Higher on a two, or Lower on an ace, is a near certainty and pays just over even money; calling against a middle card pays much more.