Revenge Of The Smurfs, The (GBA)

Level 1 codes
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Password - Effect

42726 - Carnivorous Plant
71026 - The Black Forest
07801 - The Bridge
14226 - The Forest
60443 - The Tree

Level 2 codes
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Password - Effect

32381 - The Dam
17133 - The Field
70726 - The Haunted Lake
72811 - The Lake
54246 - The Swamp

Level 3 codes
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Password - Effect

57046 - The Cave
50461 - The Cave Entry
67236 - The Dragon
40651 - The Mine
76533 - The Mountain
88746 - The Volcano

Level 4 codes
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Password - Effect

12106 - Gargamel
27551 - Gargamel's Manor
82436 - The Cliff
87121 - The Descent
02521 - The End : Credits
01836 - The Stairway
53303 - The Wall