The first one is a game where you choose number of players and each player rolls a dice randomly, the winnere is the one who gets 50 points first you can see it if you want to know more about it.
The second one is a madlib where you enter words you want and check what if the madlib you made make sense. Try it, its good.
the third one is a math exercise where you do ten questions and check the time you used to finish those questions. You can leave a question when you've got the true answer. Go for it and test you brain speed in maths.