Here are some cheats and tips for the game Robotron 64.
50 Extra Lives:
On the Setup menu press Up, Up, Down, Down, Left, Right, Left, Right,
C-Left, C-Right, C-Left, C-Right.
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Flame Thrower:
While playing press Down, Right, Down, Right, C-Right.
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Four-Way Fire:
While playing press Down, Down, Up, C-Right.
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GameBoy Mode:
On the Setup menu press Up, Down, Right, C-Left, Down, Up, Left,
C-Right, Up, Down.
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Level Select:
On the Setup menu press Down, Up, C-Left, Down, C-Left, C-Right, Down,
C-Right.
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Radiation Spray:
While playing press Up, Down, C-Right, C-Left.
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Shield:
While playing press Down, Left, C-Left, C-Right.
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Speed Up:
While playing press Left, Left, Right, Right, C-Up.
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Three-Way Fire:
While playing press Right, Right, C-Left, C-Down.
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Two-Way Fire:
While playing press Up, C-Up, Up, C-Up.