Straight to the point: Zoo Plus Pairs is a 6×6 grid with 18 pairs, playable in your browser right now. It is tuned for quick runs, honest difficulty, and controls that make sense the first time you touch them.
Every round deals a fresh shuffle, so there is no memorising the layout - only the cards you have actually seen this round. Fewer moves means a better score, and your best result is saved on the device. The a 6×6 grid with 18 pairs, so the middle of the board fills up fast and every flip matters more.
It suits anyone with a queue to wait in or a kettle to watch: students between classes, commuters, parents stealing ten quiet minutes. There is no meta-progression to lose and nothing to catch up on - a week away costs you nothing but a little sharpness.