Fulcrum is a card game set in medieval times, comprised of 54 poker-sized cards, and has both single-player (patience-style) and two player (head-to-head) rules.
In solo mode, place two trebuchet cards from your hand underneath any of the falling comets. Cards vary in value, depending on whether they match either the suit or colour of the comets. If you successfully place cards with equal or higher value underneath the comet before it hits the ground, it's destroyed. Otherwise, the game is over.
In head-to-head mode, comets fly overhead, and you must compete with your neighbouring castle to knock them out of the sky using the same points system as the solo mode. The player with the highest value destroyed comets at the end of the game is the winner.