I couldn't sleep last night so I figured I'd test Nintendont a little bit, been a while since I played with it, played some Nintendo Puzzle Collection and Sonic Mega Collection to test them out...
I played Nintendo Puzzle Collection for a couple of hours, all 3 games, didn't notice anything wrong, I'm really good at Dr. Mario and I'm not half bad with the other two, though Yoshi's Cookie I'm not a big fan of, it's easy, just not very fun imo.
As for Mega Collection I only played Blue Sphere for a couple hours to test the sound issue, again I'm really good at this game, always getting a perfecting, anyway the sound issue is still there as I described multiple times, the delay still happens until you bring the Z menu once then you can play for hours with no issue, unless you change the game then you need to press Z again.
Just thought I'd mention it again, please don't take this as "pegging for a fix" but more as "confirming a small issue" and it's up to the devs wither they wanna look at it or not, personally it's something I can live with.