I decided to make a list of the easiest and best games to play. The maximum amount of mp you can get from playing a game is 1500mp per time you play it ( Max is 3 times a piece). So The amount of points that I listed is exactly how much it will take to earn 1500mp that way you don't waste your time. These are just a few of my favorites:

1) Newth Snowboarding- 300 Pts. Needed

2) Shoot the fatty- 500 Pts. Needed

3) Oglue Lunch- 3,000 Pts. Needed

4) Blackjack- 300 Pts. Needed

5) Protect the Egg- 60 Pts. Needed

6) Gumball Machine Madness- 500
Pts. Needed

7) Rofling Stamper- 300 Pts. Needed

8) Whack an Azul- 37,500 Pts. Needed

9) Pearl Skipping- 43 Pts. Needed

I hope this helps.