XDR: X-Dazedly-Ray

Credits
There are credits in the ROM, but they aren't shown in the ending. In fact, the code to show them is jumped over; use patch code 2E36:4E714E71 (which nop out the branch around the credits code) to show them.

The ending song was timed to the completed staff roll; as a consequence, you only hear part of the song during normal gameplay. You can hear the full song in the sound test (song 06).

Debug menu
Boot up with patch code 1E8A:FFFF to access a debug menu. Apparently the only way to exit an option is to reset.
 * Normal Mode: exit
 * Object Move Test: ?
 * Hit Limit: ?
 * Scroll Test: test scrolling on the first level. Hold A to scroll faster
 * Map Position: test coordinate system. Hold A to scroll faster.

Other ROM flags

 * Setting word 1E88 to any nonzero value makes you both invincible and able to destroy enemies by touching them