Enable the "Invincibility" code. Find any area that has a trap that you need the Zappfly to activate (such as a boulder or box). Stand underneath the boulder enough so that you can still shoot the target. You must be in first person view through all of this. Let the boulder or box land on you, which normally crushes you. After the boulder or box lifts itself up, walk away and get out of first person view. You should not be able see yourself, but are still there. Note: After you have done this, you will not be able to move without attacking or being in first person view. Do not save the game after doing this.