R-Type DX [GBC]

Invulnerability
Beat the DX game mode on 10 credits or less, then in a non-DX game press Select+A to become indestructible.

Level Skip
If you've already finished a stage, you can skip it by pausing the game and then pressing the B Button.

Unlock the "De Souza Editor"
To unlock the De Souza Drawing Editor: You must first beat R-Type, R-Type 2, and R-Type DX. Then, at the main menu, press right on the D-Pad and the De Souza Editor option should appear.

Quick reset:
Hold B during game play and power the Game Boy off and on while continuing to hold the button. The game will resume at the start of the last level played with five lives but no points or power-ups.

Drawing mode:
Successfully complete the game in R-Type I Enhanced, R-Type II Enhanced, and R-Type DX. Press Right at the game type selection screen until the De Souza drawing editor option appears. Then, press Start to begin.