Cheat mode
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At the title screen, press L, Select, A, Select,
R, A, L, Select.
All levels
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At the title screen, press L, Select, A, Select,
R, A, L, Select. Press Select, R, and L to scroll through
the levels. Select a level, then press Left to highlight
the Start-option with the boomerang.
Lakamul Rain Forest level
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At the title screen, press A, L, A, R, A, L, Select, Select,
Start.
Nine continues
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Quickly and repeatedly press Start at the continue screen
until the remaining number of continues increases to nine.