At the title screen, highlight Options, hold Up (now highlighting Start) and press Start. The sound test is a bit confusing to use since there is no text. Press Up/Down to toggle between Music (upper) and SFX (lower), press Left/Right to choose a track, and press Start to play it.
Contributed By: LuigiSan.
Hard Difficulty Passwords
Enter these at the password screen to jump to the desired level on the Hard Difficulty.
Effect Password Level 2 DLTLWKVYYC Level 3 GNYLWKWVPP Level 4 DNYLSRWVPT Level 5 GLZLSRSVPW Level 6 DLZLBVSVVB Level 7 GNZLBVBQVL Level 8 DNZLBVBQVN Level 9 GLYNBVBQQD
Contributed By: AWing Pilot.
Medium Difficulty Passwords
Entered at the password screen.
Effect Password Level 2 QVYLWKVYYC Level 3 TRYLWKWVYY Level 4 QRYLSRWVPT Level 5 TRZLSRSQPS Level 6 QVZLBVSQVN Level 7 TRZLBVBQVL Level 8 QRZLBVBQVN Level 9 TVYNBVBQQD
Contributed By: Drunky.
Effect Password Bird Mode (press A, B, and Select to deactivate/activate bird mode) DLVTRKBBRD Easy Level 02 DVYLWKVYDG Easy Level 03 GRYLWKWVYC Easy Level 04 DRYLSRWVYL Easy Level 05 GVZLSRSQYY Easy Level 06 DVZLBVSQYZ Easy Level 07 GRZLBVBQYY Easy Level 08 DRZLBVBQYZ Easy Level 09 GVYNBVBQPK Infinite Energy DLVTRKBNRG Infinite Lives DLVTRKBLVS Level Skip (press A, B, and Select then left or right) DLVTRKBLVL Unlimited Ammo DLVTRKBWPS
On Level 9, When the stage's sole enemy appears press DOWN and you will enter a secret tunnel. Blast the incubator and the computer to view a different ending.
Contributed By: Ben Zetlitz.
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You can submit a problem report for any non-working or fake code in the lists above.