— The End.

To understand the demand, we must look at the base game’s monetization. Muse Dash is cheap upfront, but the "Just as Planned" DLC (which adds hundreds of songs) costs significantly more. Players searching for "Terminal Codes" are usually looking for:

While many codes are temporary and tied to specific events, the following have been used to unlock major content:

Yes! While there is no cheat terminal, the official game contains (often called "Gift Codes" or "Activation Keys") distributed during events.