If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Goal of game is really simple: over the time you need to choose numbers whose sum is equal to the number in the lower left corner (asterisk). With each new level the count of numbers increases, and the time is reduced. To complete level you need to clear all fields, so no numbers left at the end.
This game is played with mouse only.