Part One:

Green light: To raise your health level, hit the crate with the red cross. Your health level must be above 75% to proceed.

Red light: To replenish your ammo, hit the ammo crate.

Part Two:

Enter the secret chamber by unlocking the master lock: click on the nobs, while watching the moving red light. Once you have reached the correct number, the red light will flash. You can then move on to the next nob and repeat the procedure, again, until you have reached the last nob. Once the code has been identified, you will be taken into the secret chamber.

Part Three:

Disarming the bomb: Move the transistors, located at the bottom of the bomb, and position them on the device, between the two connectors, but watch the moving red light and wait for it to reach the connectors you are about to place the transistor on. Remember, you only have two minutes to accomplish this task. Beware, if you place the transistor in the incorrect connector, it will speed up the timer.