6 cheat codes for Resident Evil 2 on PS1.
RE2 (1998) has no button codes — the 'cheats' are earned unlockables and one famous glitch. Sites claiming typed codes are GameShark/Action Replay listings. Everything below works on the original PS1 (and mostly in the 2019 remake's own systems).
No built-in cheat codes exist for this game. See the entry description for what actually works on each platform.
Beat both A/B campaigns (any order) with either character to unlock HUNK's 'The 4th Survivor'; clear 4th Survivor to unlock 'The Tofu Survivor' — a knife-only gauntlet with three inventory slots.
No built-in cheat codes exist for this game. See the entry description for what actually works on each platform.
Rank A runs (few saves, fast clear) award the infinite-ammo Matilda hand>gun bullets pouch equivalent: clear with Leon for the rocket launcher (Rank A, no special items) and with Claire for the gatling gun/minigun — originals: rocket launcher for Leon A-rank, gatling gun for Claire A-rank; they appear in the next run's item box.
No built-in cheat codes exist for this game. See the entry description for what actually works on each platform.
The Battle Game mode (Dreamcast/PC) and SPECIAL series unlockables grant unlimited weapons — earned by clearing scenarios with high rank, not codes.
No built-in cheat codes exist for this game. See the entry description for what actually works on each platform.
PS1 original: the Ink Ribbon/first-aid spray stack reorder trick can duplicate a magazine-loaded weapon (the 'auto-9/Sparkshot ammo dupe' era glitch). Version-dependent — fixed in some re-releases.
No built-in cheat codes exist for this game. See the entry description for what actually works on each platform.
Brad Vickers (RE1's pilot) appears as a zombie in the RPD parking lot after a time threshold — kill him for the special 'EX' key in Leon B / Claire B.
No built-in cheat codes exist for this game. See the entry description for what actually works on each platform.