Snap is a reaction game. The pack is split 26 cards each and turned onto a single central pile automatically, one every 1.2 seconds, alternating between the two decks. Whenever a card matches the rank of the one before it, the first player to call snap takes the whole pile. The CPU is watching too, so a match is a race rather than a free pile.
No points are kept; the counters are simply how many cards each side holds. A correct snap moves the entire pile into the winner's deck, so a long run without a match makes the next call valuable. The CPU spots only about three matches in ten, and when it does it calls between 0.3 and 0.8 seconds later — that is the window you are racing. Calling snap with no match moves the last three pile cards to the front of your deck, which the message labels a false snap. The game ends when a deck runs out at flip time, and the side holding more cards wins.
Yes — on a touch screen the game shows on-screen buttons, and games played with a mouse work by tapping.
No. Only the rank counts, so any two cards showing the same value in a row are a valid snap.
No. A timer flips one card every 1.2 seconds until a deck empties or you press Restart.