Gran Turismo 4 cheat codes finally discovered almost 20 years after its release

They only work if 365 game days have passed.
If you want try it by yourself:

- 10.000.000 Cr: Select, Left, Right, Right, Down, Up, Up, Left, Down, Up, Right, Left, Down, L1, R1, Select

- Pass a license: Select, R1, Select, R1, Select, L2, L2, R2, R2, L1, Select, Select

— Nenkai (@Nenkaai) March 25, 2023

The newly discovered Gran Turismo 4 cheats can be used only after 365 in-game days have been passed. You can use the following cheat codes in Gran Turismo 4:

• Get 10,000,000 Credits from GT Mode screen: Select, Left, Right, Right, Down, Up, Up, Left, Down, Up, Right, Left, Down, L1, R1, Select
• Pass any license from License selection screen: Select, R1, Select, R1, Select, L2, L2, R2, R2, L1, Select, L1, Select
• Earn Gold rating in any license test from License Test selection screen: Select, Select, R1, R2, L2, L2, Select, L1, R1, Select, R2, L1, Select
• Earn Gold rating in any event from Event Course Selection screen: Select, L1, Up, Up, Select, R1, Down, Down, Select, L2, Select, R2, Select

These Gran Turismo 4 cheat codes also unlock rewards that come with a gold rating and skip 24-hour races. Apparently, the cheats can even work in 2006's Tourist Trophy since it uses the same engine as Gran Turismo 4. Gran Turismo has been a long-running racing game series, with the most recent game being Gran Turismo 7 that launched last year for PS5 and PS4. Gran Turismo 7 is getting a new update soon, which will allow you to play it on PS VR2.