Quake....im lookin for a old game u could play on WIN 95.... remember u had to load from the command line?

it may have been quake, i am remembering u could change the gravity now that ive been lookin on GAMEWINNERS for the codes, but i think i remember typing in GOLD to load the game tho. Anyways when the game starts,, ur up in a little hallway... and soon as u start the game a NAZI enemy climbs the ladder and u have to kill him,,, then u go down into an open arena and there are more... there are homing missles and i remember u could enable a gravity code... im pretty sure u had to collect things tho, had to find keys and im pretty sure jewels or somethin else not quite sure... but i know for a fact u could blow the nazis up and they would explode in like a 20 foot diameter.. PLZ HELP