Capitals of Europe: which country?
Learn the capitals little by little. Pick the country among six, or type it, in English or French (small typos are fine). You start with a few famous capitals; new ones come in as you get them right, and the ones you miss come back until they stick. It never ends: quit whenever you like, your progress stays on this device.
Keyboard: 1–6 to pick a country, Enter for the next capital.