To acquire this trophy, you must build the bridge across the lava on the right hand side of the screen. Every time you kill an enemy, a white piece of the "bridge" will appear on the LHS. Simply move over it then slide to the right. The piece will be attached and automatically detach in its proper place. Once you have put enough pieces and completed the bridge a tone will sound and you now can move over it to the hidden zone. There you must simply shoot Satan once and the trophy will pop .