H Key Room

The H Key Room is accessible from the A Level.

On entering the room, you are notified: "BRING A GUN".

Strategy
There is a red/yellow laser which instantly destroys you and any items that intersect it.

Bring any gun into the room and fire it (above your head) to knock the blue cube off the button to disable the laser.

In the next room, pick up the Cyan Gunman to hold it above your head, and use it to shoot the electric green cubes.

In the next room, pick up the red Red Gun to use to destroy the bricks.

Push a Blue Gem, H Key, Green Gem and Inventory Book into a Save Room collector to collect them.