If you received one of the 8 endings that unlocks postgame content (any of the individual character routes, Hol Horse End or the Succession End) you'll be admitted to the Developer's Room after the credits. Here, you can talk to characters to learn more about the backstory, use the computer to make a character code for the player-vs-player minigame, and most importantly, exchange Badges of Honor for New Game + and other special features.
Talking to Steel will allow you to reset EXP levels and Friendship Points. Resetting levels will not erase skills you've learned from scrolls or boosts to base stats gained from status-up items like Starplatodine. In addition, on the fourth playthrough and up, you can save the game in exchange for a Badge of Honor.
The first 4 machines from the left unlock New Game + features:
- New Game + in exchange for 1 Badge of Honor. (Free on the 3rd playthrough and up)
- King Crimson, which gives you the option of skipping in-game cutscenes, in exchange for 3 Badges of Honor. If you already have King Crimson enabled here, you can disable it and get 10x Phantom Blood and 100,000G as compensation. (You will not get your Badges of Honor back.)
- Star Platinum: The World, which gives Jotaro a time stop ability, in exchange for 5 Badges of Honor.
- Josuke's Disc in exchange for 9 Badges of Honor. This is not just cosmetic, but an original story for Higashikata Josuke. However, neither of his endings allow access to the Developer's Room, so be careful not to overwrite your previous file.
The vending machines on the right unlock various equippable items and skill scrolls that can be used on repeat playthroughs.
|Luck & Pluck Blade||10,000||A legendary sword. Power/Spirit +30, nullifies Fear/Bind/OffGuard|
|Steel Balls||10,000||Nullifies Dizzy/BlowBack/CantFind/Darkness|
|Rohan's Manuscript||10,000||Halves SP cost of techniques|
|Ripple Mask||1,000||Ripple training mask. Prevents Poison and Ripple.|
|Cold-Proof Suit||10,000||Halves Ice damage/nullifies Frozen status when equipped.|
|Flame-Proof Suit||10,000||Halves Fire damage/nullifies OnFire when equipped.|
|Insulating Suit||10,000||Halves Electric damage/nullifies Surge when equipped.|
|Indestructible Coat||10,000||Halves physical damage/nullifies Bleeding when equipped.|
|SPW Armor||20,000||Power, Durability, and Speed +15, Spirit +2. Raises evasion. Halves damage from all physical and elemental attacks except for Light and Dark. Prevents Bleeding, BlowBack, Frozen, OnFire, Surge, and Bind.|
|Secret Book Vol. 1||1,000||Teaches Ripple Breathing skill.|
|Secret Book Vol. 2||5,000||Teaches Ripple Rush skill.|
|Secret Book Vol. 3||5,000||Teaches +- Ripple skill.|
|Secret Book Vol. 4||10,000||Teaches Sunlight Yellow Overdrive skill.|
|Secret Book Vol. 5||15,000||Teaches Ripple Cutter skill.|
|Secret Book Vol. 6||15,000||Teaches Scarlet Overdrive skill.|
|Secret Book Vol. 7||15,000||Teaches Turquoise Blue Overdrive skill.|
|Secret Book Vol. 8||20,000||Teaches Metal Silver Overdrive skill.|
|Secret Book Vol. 9||50,000||Teaches Thunder Split Attack skill.|
|Secret Book Vol. 10||100,000||Teaches Thunder Cross Split Attack skill.|
|Secret Book Vol. 11||100,000||Teaches Ripple Quake skill.|
|Secret Book Vol. 12||100,000||Teaches Ripple Gale skill.|
|Psychology 101||100||Teaches Fearless Laugh skill.|
|Doraecat Comics||100||Teaches Laugh skill.|
|Training For Boys||100||Teaches Loud Yell skill.|
|How Now, Kowtow||100||Teaches Kowtow skill.|
|Low Blows||100||Teaches Bluff skill.|
|Looking For Trouble||100||Teaches Provoke skill.|
|Scary Story||100||Teaches Cry skill.|
|D4C Disk||30,000||A mysterious disk that prevents 1HKO.|
|Missile||2,000||A missile complete with a portable launcher.|
|Nuclear Warhead||50,000||A warhead complete with a portable launcher.|
|1000 EXP||10,000||+1000EXP to all party members.|
|10,000 EXP||80,000||+10,000EXP to all party members.|
|UV Flash Grenades||5,000||Special grenades that release ultraviolet light.|
If you cleared the game 5 times, you can also buy:
|Chaotic Key||999,999||Allows Chaos Mode to be selected when starting a new game. Can also be purchased from the treasure chest regardless of the number of playthroughs.|
If you cleared the game 10 times, you can also buy:
|Book of Evil||10,000||+1~3 bad karma.|
|Book of Cleansing||10,000||-1~3 bad karma.|
|Deep Pass Water||100,000||Holy water taken from the Tibetan Nu. One-time buff to all stats in battle.|
|Abbacchio's "Tea"||500||Inflicts physical damage + status ailments on an enemy.|
|Screwball||10,000||Increases the probability of getting the event Revenge in Chaos Mode.|
|Stone Mask Fragment||10,000||Increases the probability of getting Strange Family or Destiny of Zeppeli in Chaos Mode.|
|Family Photo||10,000||Increases the probability of getting Strange Family, Parent-less Household or Orphan.|
|Creepshots||10,000||Secret photos of... Jotaro? Adds to Chaos Mode.|
If you cleared the game 15 times, you can also buy:
|Rotten Blood||100||Causes the event Dissonance to occur, provided that no other family events have activated.|
If you cleared the game 30 times, you can also buy:
|GER Disc||100,000||Gold Experience Requiem's Disc. Used during End is not the End event.|
After clearing the game 10 times, you can battle Stroheim by talking to him.
|Name||HP||Dropped EXP||Dropped G||Dropped item||Notes|
|Stroheim||9999||410,681||6||UV Amplifier||Since you can't use the radio to equip or change tactics in the Dev Room, you'll have to do so before fighting Vins (or before entering the mansion on the Succession End). His Rocket Punch can inflict Stop, BlowBack, or Dizzy and stunlock you, so the Steel Balls are useful here. Defeating him drops the UV Amplifier, a limited-use version of the Ultraviolet Lasers that hits all enemies.|
Deus Ex Machina
If you have 99 Badges of Honor, talking to Golem (Clayman's Husband) in the Developer's Room will have him offer "Cheats" in exchange for all 99 of the badges. He warns that this will break the game, but since you have 99 badges, you've probably done everything anyways. Doing this will give you the "Deus Ex Machina" equipment. According to the description, "Prevent Ailments and Critical Hits, halves SP use." This includes every status effect except for Bashful, Corrode, Stomachache, Sick, & Hungry. It also increases evasion, and when it is equipped, it also appears as the equipment of your other party members, allowing them to gain its effects.
In addition to that, enabling 'cheats' will put 99 of every stat-raising item into your inventory, as well as 99 of all of the repackaged forms of the stronger healing items (Super Diamond C, Overdrive SP, G.E.R. Deluxe, and Ripple Champagne). Finally, the default equipment of the other party members will be added to your inventory as well.