CheatCodes.com has all the official Tetris Plus PSX cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Wednesday June 19, 2013 for Tetris Plus are shown below.
Choose "Puzzle Mode" and select the "Password" option. Press [Down(2), Right, Up (2), Right, Up(3), Right] two times, then press X. The color of the block should be Light Blue, Pink, Green, Light Blue, Pink, Green. A stage select option will appear when the game begins.
Beat a level in puzzle mode. Then, hold R2 after the professor falls to make him walk faster.
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