Unlockable - Unlock Extra Difficulties | |
| Unlock Hard Difficulty | Beat the game on Normal Difficulty. |
| Unlock Expert Difficulty | Beat the game on Hard Difficulty. |
Alien Syndrome Cheats and Tips [PSP]
No extra stories for Alien Syndrome
Unlockable - Unlock Extra Difficulties | |
| Unlock Hard Difficulty | Beat the game on Normal Difficulty. |
| Unlock Expert Difficulty | Beat the game on Hard Difficulty. |