Memory pairs (also known as concentration or match the pairs) is simple: flip two cards at a time, and if they match, they stay face-up. If they do not, they flip back and you try to remember where they were. Clear the board to win.
Every puzzle on this page pairs each European country with its capital city. The standard 16-card grid has 8 pairs, and the larger sizes hold more. It is a genuinely educational brain-trainer: you will pick up the capital cities without really trying, and the time and move counters let you chase your own best scores.
Use the Peek button if you need a quick refresher. It reveals every card for a few seconds. Progress saves locally, so you can pause mid-game and come back.