=>Chainsaw Bug: First of all, collect the chainsaw in stage 2. When you have
this, simply choose a weapon and fire all of your ammo, but keep holding
down the fire button while the game automatically switches to a new weapon.
There is a good chance you will receive a more powerful weapon for free.
For example, use up your pistol and get the plasma rifle. The game usually
awards weapons in the standard order, but you can't seem to get the BFG.
=>Level Jump: In Shores of Hell part two, find the room filled with pillars
and imps. From there, enter the room filled with green sludge, then turn
right into a hall and follow it until you find a room with a demon. There,
turn left into another hall and follow it until you reach a room with an
EXIT sign... it will move you two levels ahead.