If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
You have to beat all your opponents in a truck racing competition, but you need to be patient and wait
for the right moment to be able to overcome your opponents. After each level, a new truck is unlocked. Beat all your opponents to unlock all trucks, and prove that you are a good truck driver.
Use arrow keys to drive your truck.