H Key Level

This level is available from the A level. On entering, you are told "BRING A GUN".

First Area
There is a red laser preventing access to the rest of the level. Use any gun and hold it over your head and fire at the blue cube on the button to disable the laser.

Second Area
The electric Green Cubes will damage you if you attempt to move past them. Pick up the Cyan Gunman and hold it above your head to fire at the cubes to destroy them. Follow the door to the third area.

Third Area and above
Bricks are blocking access to the left side of the level. Enter the other tall door and pick up the Red Gun (or red gunman) and use it to fire at the bricks.

Enter the now-accessible tall door on the left to reach the area above. Fire the red gun at the brick wall and then at the bombs to set them off, destroying the final wall.

Return down and take the short doors to the top to collect a Blue Gem, H Key, Green Gem and a book about your inventory.