Alien Trilogy is a classic first-person shooter for the PS1 that challenges players to survive against the terrifying Xenomorphs from the Alien franchise. While the game offers a satisfying and challenging experience on its own, there are also several secrets, unlockables, and codes that offer additional challenges and rewards for players who are willing to explore the game’s environments and complete certain tasks.

Here are some of the most notable secrets, unlockables, and codes for Alien Trilogy:

  1. Cheat Codes: There are several cheat codes that can be entered at the game’s main menu to unlock various features. Here are some of the most useful codes:
  • Infinite Ammo: L2, R2, L1, R1, Circle, Triangle, Square, X
  • Invincibility: L2, R2, L1, R1, Circle, Triangle, X, Square
  • Level Select: L2, R2, L1, R1, Circle, Square, X, Triangle
  1. Secret Levels: There are several secret levels hidden throughout the game that can be accessed by finding hidden switches or completing certain tasks. Here are some of the most notable secret levels:
  • Level 6: To access this level, you need to find a hidden switch in Level 4. The switch is located behind a false wall in a room with a dead Marine.
  • Level 11: To access this level, you need to find a hidden switch in Level 10. The switch is located in a hidden room behind a wall that can be destroyed with explosives.
  • Level 15: To access this level, you need to find a hidden switch in Level 14. The switch is located in a room with a broken floor. You can reach it by jumping from a nearby ledge.
  1. Bonus Content: Depending on the version of the game, there may be additional bonus content, such as behind-the-scenes videos or concept art, that can be unlocked by completing certain tasks or finding hidden items. Here are some examples:
  • Concept Art: To unlock concept art, you need to collect all of the Data Discs scattered throughout the game’s levels. The discs are hidden in secret areas and can be difficult to find.
  • Behind-the-Scenes Video: To unlock the behind-the-scenes video, you need to complete the game on the hardest difficulty setting.
  1. Alternate Endings: There are multiple endings to the game, depending on the player’s performance and choices throughout the game. Players who are able to complete the game under certain conditions may unlock special endings that offer additional story content. Here are some of the most notable alternate endings:
  • Bad Ending: If you fail to save enough Marines throughout the game, you will get a bad ending where the Xenomorphs overrun the colony and kill everyone.
  • Good Ending: If you are able to save enough Marines and complete all of the game’s objectives, you will get a good ending where you escape the colony and destroy it with a self-destruct sequence.
  • Secret Ending: If you are able to complete the game on the hardest difficulty setting without using any cheat codes, you will unlock a secret ending that reveals a hidden plot twist.

Overall, Alien Trilogy offers a good degree of replayability thanks to its various secrets, unlockables, and codes. Whether you want to unlock cheat codes, find secret levels, or discover alternate endings, there is plenty to keep you engaged and challenged in this classic first-person shooter.

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