Levelcodes:

 Zone 2  TAFRGYBlRR
 Zone 3  CRGRGYBLRY
 Zone 4  FUMRGYBLRL
 Zone 5  SIFUGOBLLR
 Zone 6  TAGUGOBLLY
 Zone 7  CRMUGOBLLL
 Zone 8  FEMUGOBYSL

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 Hold [F10] while entering one of the following cheat codes. Then, hold [F10]
 and press [F5] to activate the corresponding cheat function as many times as
 needed. To enter another code, hold [F10] and press [F6] to disable the current
 code. Then, hold [F10] and enter the next code.

 [F2][F1][F4][F3][F3][F4][F1][F2] - Turn blue player to black
 [F2][F1][F4][F3]                 - Full shield
 [F2][F4][F1][F3][F1][F3][F4][F2] - Reload weapon 0
 [F4][F3][F1][F2][F4][F3][F1][F2] - Reload weapon 1
 [F2][F1][F2][F4][F2][F1][F3]     - Reload weapon 2