Klax - Platform: Gameboy Color

Furd Herder mini-game
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Enter Green Alien, Green Alien, Square, Green Alien as a 
password to unlock a Minesweeper-like mini-game. 

Snake mini-game
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Enter Circle, Diamond, Square, Green Alien as a password. 

View Klax history
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Enter Yellow Alien, Pillar, Pillar, Green Alien as a password. 

View Klax myth
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Enter Square, Pillar, Diamond, Green Alien as a password. 

View programmers
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Enter Green Alien, Green Alien, Circle, Square as a password. 
Note: A Game Boy Printer is needed for this trick. 

View credits
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Enter Pillar, Yellow Alien, Diamond, Diamond as a password. 

Adventure mode (European version)
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Enter Square, Yellow Alien, Green Alien, 
Yellow Alien as a password. 

Level Password
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1 Yellow Alien, Pillar, Pillar, Circle  
6 Circle, Yellow Alien, Square, Yellow Alien  
11 Yellow Alien, Yellow Alien, Square, Green Alien  
16 Diamond, Yellow Alien, Green Alien, Diamond  
21 Diamond, Square, Diamond, Green Alien  
26 Pillar, Yellow Alien, Square, Pillar  
31 Green Alien, Circle, Pillar, Pillar  
36 Circle, Circle, Yellow Alien, Yellow Alien  
41 Pillar, Diamond, Diamond, Circle  
46 Yellow Alien, Diamond, Circle, Pillar  
51 Square, Diamond, Yellow Alien, Square  
56 Pillar, Square, Square, Yellow Alien  
61 Circle, Square, Circle, Green Alien  
66 Circle, Diamond, Diamond, Green Alien  
71 Circle, Square, Square, Pillar  
76 Green Alien, Green Alien, Yellow Alien, Circle  
81 Pillar, Circle, Circle, Pillar  
86 Square, Green Alien, Diamond, Circle  
91 Yellow Alien, Green Alien, Circle, Diamond  
96 Pillar, Pillar, Green Alien, Square