NumGrid
It's just a small puzzle game that I've whipped up on a weekend. You'll have to match the numbers up to others with the same value or with a value that will add up to 10. Further instructions are available through the help button.
Play as long as you want. As soon as you're happy with your score you can post a screenshot of your score page anywhere you want.
This game does not save your progress! As soon as you close it you're done. This also means that you can simply restart by restarting the game.