Here's how to earn the cheat codes.
| Cheat | Complete |
| Fruity Colors Mode | Complete Level 1 |
| Pen and Ink Mode | Complete Level 2 |
| Gouraud Mode | Complete Level 3 |
| Big Hands and Feet | Complete Level 4 |
| All Maps | Complete Level 5 |
| All Guns | Complete Level 6 |
| Big Head Mode | Defeat Level 4 boss |
| Tiny Mode | Defeat Level 5 boss |
| Infinite Ammo | Defeat Level 6 boss |
| All Special Items | Defeat Primagen |
| Invincibility | Defeat Primagen |
| Infinite Lives | Defeat Primagen (On Hard) |
Go to the enter cheat menu and enter the following codes:
| Cheat | Enter |
| Master Cheat | BEWAREOBLIVIONISATHAND |
| View Credits | ONLYTHEBEST |
| Pen-and-Ink Mode | IGOTABFA |
| Zach's Face On Health Icons | AAHGOO |
| Juan's Face On Health Icons | HEEERESJUAN |
| Big Hands and Feet Mode | STOMPEM |
| Big Head Mode | UBERNOODLE |
| Stick Men Mode | HOLASTICKBOY |
| Tiny Enemy Code | PIPSQUEAK |
| Blackout Mode | LIGHTSOUT |
| Fruity Stripes | FROOTSTRIPE |