Note: This game is also titled Tantei Jinguuji Saburo DS: Inishie No Kioku.

At the main menu, select the "Password" option. Then, enter one of the following passwords at the typewriter to unlock the corresponding cheat option:

What is a password? (unlockable #1)

Enter "AAAA" as a password.

Picture Gallery (unlockable #2)

Enter "LEET" as a password.

Movies (unlockable #3)

Enter "ROSE" as a password.

Picture Gallery (unlockable #4)

Enter "CARS" as a password.

Visuals 02 (unlockable #5)

Enter "GONG" as a password.

Sound Player (unlockable #6)

Enter "BIKE" as a password.

Hints (unlockable #7)

Enter "HINT" as a password.