Activate a forward shield, then press Option 1 and Pause to restart the game. The shield will be floating in front when the game resumes. Firing a weapon will return it to its normal position.Ride a bird
In level 19, wait for a bird to appear from the left. Jump on the bird as it approaches to ride it across the screen past the difficult sections of the level. Jump to the right with each bounce to stay above the same bird. Kill the bat when it appears.