F-22

F-22 is an unlicensed shoot-'em-up featuring what might be some of the worst cutscene graphics to ever appear in an NES game, first known to be seen on the Arcade Action II's AT-103 multicart.

There's also music from Star Wars in some of the later levels. That's nice.

Unused Graphics#

While seemingly original at first glance, F-22 is actually a massive hack of the Famicom version of 1943. F-22 uses a CHR chip for graphics data, while 1943 stored its sprites in PRG; as a result of this, almost all of 1943's graphics are still present in F-22's PRG data, completely unused.

Additionally, the Shanghai Paradise Science & Technology Co. logo is present in the CHR data. This is presumably used in the original release of the game, but said version has yet to be found.

Graphics for an exit option are present in the CHR bank used by the options screen. This was likely scrapped as the menu can simply be left by pressing Start.

Credits Screen#

This needs some investigation. Discuss ideas and findings on the talk page. Specifically: Screen is definitely unused in the Waixing version. Is it used in any alternate variants?

If byte $1C04D (of which its initial byte varies depending on the version) is changed to #0A, a credits screen can be seen. Translated, it reads:

Programming: Xi Feng
             Yan Rong
Artist: Pepe

Version Differences#

Navigator#

This title screen reskin appears on consoles published by Power Joy.

Waixing version#

A later release by Waixing exists from 2005, which changes the title screen, removes the cutscenes and ending, and reduces the number of levels from 16 to 3.