Cheat to Unlock All Dungeons in Pokémon Mystery Dungeon: Blue Rescue Team? Doesn't Exist.

No such cheat exists. Dungeon unlocks are tied directly to story progression, rank increases, and specific Wonder Mail missions. There is no "unlock all" code (Action Replay, GameShark, or otherwise) that safely grants access to every dungeon.

How Dungeons Actually Unlock (Legitimately)

• Main Story: Complete chapters → new areas open (e.g., Mt. Steel → Sinister Woods → Mt. Blaze).
• Rescue Team Rank: Earn Rank Points → reach Gold Rank → unlocks Western Cave, Wish Cave, Joyous Tower, Purity Forest, Buried Relic (the 99-floor post-game dungeons).
• Wonder Mail / SOS Mail: Specific codes unlock legendary dungeons (e.g., Articuno → Frosty Forest, Zapdos → Mt. Thunder, Moltres → Mt. Blaze, Mewtwo → Western Cave, etc.). These are legitimate, developer-intended codes found in-game or via Nintendo events.
• Friend Rescues: Rescuing fallen teams can unlock hidden dungeons.

Why a "Unlock All" Cheat Would Break the Game

• Post-game dungeons (99 floors, level reset, no items) require max-level teams and strategy. Entering them early = instant wipe.
• Story flags and cutscenes would trigger out of order, causing script breaks/softlocks.
• Wonder Mail codes are the intended way to access optional content early.

Legitimate Wonder Mail Codes (Examples)

• Frosty Forest (Articuno): 7K7R HF8C J@5F 8Y@H (varies by region/version — use a generator like ProjectPokemon for your exact version).
• All Legendary Dungeons: Search "Blue Rescue Team Wonder Mail generator" — input your team name/ID to get valid codes.

Play the game. The progression is the fun.