If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Package the chocolates according to the orders listed at the top of the screen. Mold a plain (brown) chocolate blob as it passes underneath a colored stamper, then hit it with the Choco stamper to complete the order. Fill all the orders before the timer runs out to complete the level.
This game is played with mouse only.