Recommended Boss order
The following is the recommended order of Boss to take on based on weapon weaknesses. Note: Vile is weak against Yeti's ice weapon:
Gigavolt Man O War
Use the following Boss order, with the corresponding weapon weakness:
Optic Sunflower (Green Spinner)
Dark Mantis (Shining Ray)
Avalanche Yeti (Shadow Runner)
Burn Rooster (Drift Diamond)
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Enter the following codes at the "Press Start" screen. Once you hear a confirmation voice, start a new game on either Normal or Hard. The items will be then available at the R&D Lab.
Press Square, Square, Right, X, R1.
Press Down, R1, Up, L1, Square, X, Triangle, Circle.
Press L3, L3, R3, L3, L3, R3, L3, L3, R3, L3 L3, R3.
Press L1, L1, R1, R1, L1, L1, L1, L1.
Press L2, L2, L2, R2, R2, R2, L2, L2, L2, R2....
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