If you're looking for a game that's a little different from the usual ones, you should definitely check out PasswordHacking. Not only is it a fun and engaging game, it's also very easy to play and understand, so even kids can easily learn how to play it.

The gameplay is very simple. In fact, the whole point of the game is to guess a set of numbers that's been proposed by the computer. The more correct numbers you guess, the more points you'll earn. The more points you earn, the higher you'll rank on the global leaderboard, which is updated every day.