Are there any differences between the US and Japan R-Type HuCards besides being only on one card in the US?
Adding PCE console specific layer on top of that, makes for an interesting challenge (no, not a reference to Ys II).
I have no clue what GP32 is... doesn't sound very exciting. Anyway, Shinobi for the PC Engine is missing the bonus stages as well as the entire second level (consisting of 3 stages and a boss fight). Kind of pisses me off as the second level was a really good one. And I enjoyed the bonus stages as well.