Jan is trying to level up a space pirate game. Which of the following should Jan do to create more obstacles?

1. Increase the number of enemy spaceships attacking Jan's ship.

2. Add more dangerous asteroid fields for Jan to navigate through.
3. Introduce powerful boss enemies that Jan must defeat in order to progress.
4. Implement timed missions where Jan must complete objectives before a countdown expires.
5. Introduce new environmental hazards such as black holes or solar flares.