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Selecting Joint Parts
While the demo appears for joint machine, the player who gets the radio machine must enter the following codes. 
  Beta-Cannon:    Hold LU or U or RU.
  Gamma-Battler:  Hold L or R.
  Alpha-Fortress: Hold LD or D or RD.
Selecting Parts
At the stage title screen, hold B+C (over 1 sec.) and then enter the following codes. 
  Bomber:      LU
  Death Drill: U
  Missile:     RU
  Laser blade: L
  Force claw:  R
  Flame:       LD
  Chain spark: D
  Laser:       RD
Note: You can select both the arm and the sub weapon at the same time, but, if you enter codes for arm or sub weapon twice only the later code will work.