You've guessed the correct number of sand grains on a 25-mile-long beach in Australia and won a one-way ticket to the planet Knob. While rocketing through space toward Knob, you learn that the beings there, although friendly, emit a foul smell and leave a slippery slime trail as they move about.
You also discover that the next rocket back to Earth doesn't blast off until the Fourth of July, and a ticket costs $10,000!
Earn and save enough money on the planet Knob in order to buy your return ticket to Earth on July 4th.