DunDunDunpachi
Banned
I've only messed around with this title a few times since buying it, but this past weekend I sunk in some time to play (nearly) all the titles on the collection. I was using a New 3DS XL (better 3D tracking). This is definitely one of my favorite uses of the 3DS's lens-free 3D.
Power Drift - fun with the 3D off, but the 3D effect makes the road seem too "chunky", where the pieces don't marry up as cleanly.
Sonic the Hedgehog - M2 added the spin-up move which fixes my only gripe. Level design still holds up. I am reminded why Sonic hit the scene and made such an impact. Even the first game is packed with traversal variety.
Puyo Puyo 2 - it's Puyo, but in 3D.
Fantasy Zone II / W - addictive little shmups. I love how quickly the enemies can clog the screen and slaughter you. It's a devious little shmup that loves to surprise you with a ton of enemies at once.
Galaxy Force II, Thunder Blade - two BIG standouts! In a weird sort of way, this captures the old arcade spectacle far better than the other console ports. Having played both of these games in an arcade recently, I was impressed by the simple-but-effective use of 3D. Everything just pops!
Maze Walker - a cute, forgotten SEGA gem that is a perfect candidate for the 3D effect. This is a fun diversion. I wonder how many levels it has. Might be fun to beat it in an afternoon (doesn't seem to hard).
It's a major shame the other collections never came West. 3DS is region-locked, so in order to get physical copies I'd need a Japanese 3DS plus overpriced copies of Vol. 2 and Vol. 3.