Here are cheats for Playstation:

3-D Lemmings:

Stage Select: Choose 'Codes' from the main menu and then enter the password 'LAMPWICK.' Now, highlight 'End' and press X. Now just start the game and choose your stage.

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Alien Trilogy:

Cheat Mode:

Go to the passwords screen and enter IGOTPINK8CIDBOOTSON, for the password. Now go to the main menu and choose 'cheats'

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Area 51:

Alien Mode:

Start the game: Shoot the very first 3 HUMANS you see without touching [shooting] ANYTHING else. Now just play the game through.

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Battle Arena Toshinden 2:

Secret Characters:

Uranus & Master: Beat the game on level 9 or higher with any character. At the end, when the credits are scrolling, hold start to make them scroll faster. Then, if you DID do this, you can go to the ? box [random select box] and hold select to slow down the characters. Uranus and Master will now be available.

Sho & Vermillion: Beat the game on level 9 or higher with Master. At the the end, when the credits are rolling hold start to make them scroll even faster. Now, go to the character-select screen and go to the ? box [random select box] and hold select to make them slow down. Now, you can play as Sho or Vermillion.

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Blazing Dragons:

To go the final stage enter the password:

V?U5MK4N6LULOHW5CB

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Blood Omen: Legacy of Kain:

Refill your energy:

Press Up, Right, [], O, up, down, right, left

--note-- do NOT do this while game is Paused!--

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Codename Tenka:

Have ALL weapons:

During gameplay: pause the game then press and hold L1: Now press Triangle, R1, Triangle, [], R1, O, [], []. Now: release L1, and a new option should appear called 'all weapons' click on it, and now you have ALL the weapons.

Stage Select:

During Gameplay: pause the game then press and hold L2: Now press O,O,[], triangle,O. Release L2, and a new option called 'Level Warp' should appear, click it and then choose your level.

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Crash Bandicoot:

SUPER password:

Choose the password option and enter this as your password:

triangle, triangle, triangle, triangle, X, [] triangle, triangle triangle, triangle, [], X, triangle, O, triangle, triangle, triangle, O,[], triangle, X, X, X, X Now you have acces to ALL stages, with ALL the gems, and ALL the keys!

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Doom: while the game is paused QUICKLY enter:

Get EVERYTHING: X, triangle, L1, up, down, R2, left, left

Invincibility: Down, L2, [], R1, right, L1, left, O

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I will be updating soon