Old Maid against the CPU with a 53 card pack — a standard deck plus one Joker, which is the Old Maid. The cards are dealt out and any matching pair in a hand is discarded automatically before play. You then take turns drawing a card from each other's hand, discarding pairs as they form. The Joker has no partner, so somebody will be left holding it.
Nothing is scored beyond the two card counts. After your draw the CPU waits 0.8 seconds and then takes a card from your hand at random. You win by emptying your hand, or if the CPU is left holding only the Joker. You lose if the CPU empties first, or if the Joker is your last card. Pair removal treats all four cards of a rank as two separate pairs, so a hand can shed several cards from one draw.
Yes — on a touch screen the game shows on-screen buttons, and games played with a mouse work by tapping.
No. The CPU's cards are face down and unsorted, so every draw is a blind pick.
No. Pair matching skips the Joker, so it stays in play until one side is left holding it.