A single pile of n has Grundy value n, so the sum of piles is their XOR. XOR 0 is a losing position for whoever is on move. Take the whole pile to win.
The rival throws a fixed printed sequence, so read the next throw and answer it. Nothing here is luck - keys 1 / 2 / 3 also work.
Hit, stand, double, split and insure against a dealer who stands on 17.
The patience classic: four free cells, undo and one-click auto finish.
Heads-up Texas Hold'em against a bot, with blinds, raises and a full showdown.
Thirty seconds of whack-a-mole. Fast hits build a combo multiplier.
Pull back, aim and launch. Topple the three marked blocks in six shots.
Drop the sliding block and stack it clean. Perfect cuts keep full width.
Light-cycle duel against the CPU or a friend. Walls and trails are fatal.
