The object of the game is to reach the bell without being squashed by a cannonball or running out of time. Extra points may be earned by getting presents along the way and by jumping over the balls. After you reach the bell you will be awarded points for the remaining time and you will advance to the next screen.
The game is played with the four arrow keys to make Willy the Worm run left and right and climb ladders up and down, and the spacebar to make him jump. (Note that when jumping, Willy can change directions in mid-air. This can be extremely useful!) Any other key makes him stop.
The bonus counter is displayed at the bottom of the screen. It starts at 1000 and counts down by tens. When you finish a level, the remaining bonus is added to your score. If the bonus gets to 0, you lose a worm and start the level over. Jumping over one or more balls earns 20 points. Getting a present is 100 points. After the game, the high scores are displayed in two lists. The ‘Daily Pinworms’ list resets each time you enter the program, while the ‘All-Time Nightcrawlers’ list is saved on disk.
You can also use the editor to make your own game.