[url=http://twinbeard.com/frog-fractions]Frog Fractions[/url] is an increasingly amusing game where you play as a Frog who defends fruit from an large horde of flying insects, all while learning about Fractions! You can use the points you earn between rounds to buy a variety of upgrades, I highly encourage you to buy as many of them as possible.
And here's your only hint: If you have trouble affording a certain upgrade because you do not have enough fruit, try thinking downwards.
A friend showed me this game yesterday, and it is truly amazing, props to twinbeard for coming up with such a creative game! To see it's true beauty, you have to play it for a little while, I promise you, things get interesting.
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I think in this next session I will play it for more than 20 minutes. [spoiler]And yes, there are dragons.[/spoiler]