Spider-Man 2 – The Sinister Six – Gameboy Color

Spider-Man 2 - The Sinister Six - Platform: Gameboy Color

Invincibility
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Press Up, Down, Right, A at the title screen.

Level select
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Press B, A, Left, Down, Up, Right at the title screen. 

One hit kills with web ball
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Press Down, A, B, A(2) at the title screen.

Unlimited webs
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Press Left, Down, B, Up at the title screen.

Teddy bear mini-game
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Press A, B, A, B, Down at the title screen. 

Nightmare difficulty setting
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Press A, B, Select, Up, Right, Down at the title screen. 

Status Password
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Level 2 after defeating Mysterio MP!63C  
Level 3 after defeating Sandman PL851D  
Level 4 after defeating Vulture MM947F  
Level 5 after defeating Scorpion TS6!96  
Level 5-2 after passing the level to fight Kraven  TS6!9G 
Level 6 after defeating Kraven LR6!9G