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Game: Dr. Mario 64Console: Nintendo 64
Cheat:
Unlock Metal Mario
Set the game on normal/hard/superhard difficulty and finish it without losing a single time using Wario. When you get up to, and defeat Rudy, you will then come face to face with Metal Mario!!! You have to defeat him without losing at all (you cannot even Pause and "Redo"), and then he will be unlocked in the Vs Modes.Unlock Vampire Wario
As above, except you have to do all this with Dr. Mario, and at the end you will fight Vampire Wario. Remember you cannot lose a single time.Unlock Super Hard mode
Go to story mode and highlight the Hard difficulty setting. Now press Z and you will change this setting to Super Hard.Difficulty setting in Vs Mode
From the Character Selection Screen in Vs Mode, highlight any character and Hold L. You can then press A, or B to change the computer controlled character to 1 star (Hard) or 2 stars (Super Hard), respectively.Manufacturer: Nintendo
Release Date: 12 April, 2001
ESRB Rating: Everyone

Description:
Back in the early 1990s, after the world had gone mad for Tetris, Nintendo put out its own variant of the puzzle game that, unlike most clones of the day, actually brought some new life to the original idea. Now the classic Nintendo game, with some improvements of its own, is reintroduced for the Nintendo 64. Rather than just twisting shapes to fill vacant spaces, Dr. Mario 64 will have you matching capsule-shaped pills to fight like-colored viruses. Players earn point bonuses when stringing combos together. Dr. Mario 64 comes with the original one- and two-player modes, and introduces a simultaneous four-player mode.