Skip Leech Hunter Fight
The first fight against the Leech Hunter can be skipped entirely. Ammo and health are scarce in ̶0;Resident Evil Zero.̶1; The ability to entirely skip a fight can make later events in the game much easier. This glitch is activated after the Leech Hunter appears. This is the zombie made entirely out of leeches. Turn around and head back to the stairs you just came up. The game will skip to the cutscene that normally plays after you defeat the Leech Hunter.
Action Replay Codes
The Action Replay is a separate disc used to open a codes menu. It will recognize the ̶0;Resident Evil Zero̶1; game disc and bring up the correct code menu. New codes are added by selecting the first option in the menu, ̶0;Enter New Cheat.̶1; You must enter a master code for any Action Replay code to work. The master code for ̶0;Resident Evil Zero̶1; is "RRXJ-1GCM-EY9X4-ETFF-WG8B-9P79R." Each code will only affect Rebecca Chambers or Billy Coen, but not both.
Rebecca Chambers Codes
Rebecca Chambers has the ability to mix herbs together to make medicines. She does slightly less damage than Billy Coen and cannot move heavy objects. She is very useful in normal gameplay, but slightly less useful for players who are cheating. The code to give Rebecca infinite health is "Y5ZP-NTAT-KPW2U-KEMV-KFA0-V48N3." The code to give Rebecca infinite ammo is "2TPC-HG7C-A61TU-A5M1-UP1G-BC8EM." The difficulty of ̶0;Resident Evil Zero̶1; mostly comes from the scarcity of ammo and healing items. These two cheat codes make the game much easier to beat.
Billy Coen Codes
Billy Coen is stronger than Rebecca Chambers and does more damage. He can also push heavy objects out of the way. Players using Action Replay codes may choose to select Billy to make the game go a little faster. The code to give Billy infinite health is "MMPX-1WHN-H9MU8-AVJV-W740-FY2G8." The code to give him infinite ammo is "XC8N-NBRV-KYA5W-88RQ-QTKT-0FB6V."