I ordered PC Genjin for GameCube from
http://www.yesasia.com and I am waiting for it to arrive. The GC version is rare will the PS2 version is common for some reason... Here's hoping Yes Asia actually can get it for 30 bucks like they say!
Star Soldier for GC/PS2 is EXCELLENT, even though it changes the gameplay a little. It even has a 3 and 5 minute Time Trial BUILT IN, which is a reference to the tournament version of Star Soldier for Famicom used by Takahashi Meijin in the Game King TV special. It also has vintage commercials featuring Takahashi (Master Higgins).
Also, there is an unlockable 3D Star Soldier stage (based on the remake) in Dream Mix TV: World Fighters for PS2/GC. Check out my FAQ at GameFAQs for details on that game.
Oh, and there's a nice, new Star Soldier remake for PSP in Japan, which you can play on American PSPs of course... Plus Star Soldier (Famicom version) is available by itself for GBA or in the Hudson Collection shooting game GBA cart. Don't have the latter, but I'll get it sometime.
Adventure Island for GameCube is SO much better than the original - it saves your stage, has an easy mode, nice graphics, and original or remixed sound... Plus vintage commercials. A Must-buy for Adventure Islands fans. So is Adventure Island Collection for GBA, which has all 4 Famicom games on 1 cart, available now.
Cubic Lode Runner isn't so much of a must-have as the other 4 PS2/GC Hudson Collection games since it's Lode Runner! Well, it has less added too... I mean, they changed the game up to make it 3D (but it works)... There seem to be some unlockables, but I don't have 'em. It's the most budget-looking of all 4 games, that's for sure.