Some other titles were planned for the Supergrafx: Strider (published a lot of years later for the Arcade Card), Galaxy Force II (conversion of a Sega coin-op), a special edition of Out Run (enhanced to use the superior SG capabilities) and some more that actually I could not remember. All were to be published by NEC Avenue. Production of all these titles was halted because of the poor performances of the system. Prototypes are not known on the collector market but surely they exists! In particular Strider was at a very advanced state of development. Later the title was to be published on Super CD-Rom format but since it needed too much memory it was published only for Arcade Card. Another title, Galaxy Fight II was probably shown to the public in a very early stage of development and it was listed on many PC Engine magazines as a "Soon to be published" title.
Since I have all these titles I'll soon publish an in-depth review
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