A debug option that originally appeared in Shin Megami Tensei III: Nocturne. This has also appeared in all of the PS2 Shin Megami Tensei games except the Persona games. You can view all of the game's models as well as objects and weapons. If a model does not exist in the game, trying to load it will crash the game. Apply the code below for the USA version to appear in this menu when the game first boots, and ensure you have no memory card or save data. Otherwise, the model viewer functionality and the game will play at the same time.
Enable Model Viewer At Boot
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Watch on YouTubeJust like in Devil Summoner 1, there is an unused Mahjong Riichi mini-game. This video details Mahjong Riichi and the choices of the demons you can play with. It appears that this Mahjong Richi is largely in English as well. It's also very playable by using specific hexes in the English version.
The way to access it is a little long, but it works.
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Step 1ː In the beginning of the game's load process, activate this code.
(Notice that Mahjong is an option, but it gives some Kana/Kanji when you try.
This is because you have no demons and the game will crash if you leave.)
Step 2ː Save the game.
Step 3ː Reset the game after saving.
Step 4ː Load the game you just saved.
Step 5ː Leave Narumi's.
Step 6ː Activate these codes using a memory editorː
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Step 7ː Go back into Narumi's.
Step 8ː Go upstairs.
Step 9ː Go back down stairs.
Step 10ː Play Mahjong > Select your Demons to play with > And enjoy.
You can play Mahjong with Ukobach, Pyro Jack, Orthrus, Oshichi, Sati, Gdon, Throne, Cerberus, Muspell, Belial, Onmoraki, Enku, Vritra,, Mada, Kagutsuchi, Asura, Lucifer, Pyro Reserve 1, Pyro Reserve 2, and Pyro Reserve 3.