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.
Password Effect DLTLWKVYYC Level 2 GNYLWKWVPP Level 3 DNYLSRWVPT Level 4 GLZLSRSVPW Level 5 DLZLBVSVVB Level 6 GNZLBVBQVL Level 7 DNZLBVBQVN Level 8 GLYNBVBQQD Level 9
Contributed By: AWing Pilot.
Medium Difficulty Passwords
Entered at the password screen.
Password Effect QVYLWKVYYC Level 2 TRYLWKWVYY Level 3 QRYLSRWVPT Level 4 TRZLSRSQPS Level 5 QVZLBVSQVN Level 6 TRZLBVBQVL Level 7 QRZLBVBQVN Level 8 TVYNBVBQQD Level 9
Contributed By: Drunky.
Password Effect DLVTRKBBRD Bird Mode (press A, B, and Select to deactivate/activate bird mode) DVYLWKVYDG Easy Level 02 GRYLWKWVYC Easy Level 03 DRYLSRWVYL Easy Level 04 GVZLSRSQYY Easy Level 05 DVZLBVSQYZ Easy Level 06 GRZLBVBQYY Easy Level 07 DRZLBVBQYZ Easy Level 08 GVYNBVBQPK Easy Level 09 DLVTRKBNRG Infinite Energy DLVTRKBLVS Infinite Lives DLVTRKBLVL Level Skip (press A, B, and Select then left or right) DLVTRKBWPS Unlimited Ammo
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.