To enable cheat mode press V + T + S. Next, enter one of the codes below to activate the
following cheat function.

Function - Code

     Additional weapons - A + R + K 
     Free movement - B + Y + Z 
     Invincibility - E + L + K 
     Press F3 to jump to next world - O + M + R 
     Full database - R + Y + 1 
     Increased maneuverability - Z + O + R