A special cannon that emits a highly reflective laser. Can be discharged in a narrow passage and, due to the trajectory change when it's reflected off of walls, the laser blast will zigzag along the corridor. Very effective against giant insects, as it can reach the limit of its range without being obstructed.

Go to: http://store.steampowered.com/ and download STEAM client Click "Install Steam" (from the upper right corner) Install and start application, login with your Account name and Password (create one if you don't have). Please follow these instructions to activate a new retail purchase on Steam: Launch Steam and log into your Steam account. Click the Games Menu. Choose Activate a Product on Steam... Follow the onscreen instructions to complete the process. After successful code verification go to the "MY GAMES" tab and start downloading.