Mega Microgames indeed.
Wario Ware inc. was the first game to introduce "Microgames" by that title. These are 3-5 second quick games which are made to test your reflexes and only require you to use the D-Pad and A button. The game is seperated into several theme stages and contains many homages to classic old school nintendo games. It's insanely fun and has tons of replayability, so definitely a big thumbs up.