A harpoon gun complete with optional retracting rope has been added to Happy Wheels. It's a special object under the hazards category. It auto-aims at your character, fires once you're within a certain range, impales your character, and then sticks into stationary objects like walls and the floor. It's quite fun and shows a shift towards aggressive hazards. You can expect to see more things of this nature and it's likely Jim will add a timer to the harpoon gun as it's pretty difficult to escape.
