This app was mentioned in 10 comments, with an average of 1.50 upvotes
The Left & Right shoulder buttons register as L1 & L Trigger (instead of L Trigger & R Trigger), while C & Z show up as R Trigger & R1 (instead of R1 & R2) as you can see in the above images with the MD.emu app on the Shield.
They once registered properly in the same X-Input mode, all I've done to them is upgrade v1.13 firmware back in May & don't recall exactly when I first noticed it, because it wasn't right away.
Is there a custom beta firmware for the M30 I missed people posting about to correct this?
Why would anyone opt/settle for these (usually crappy) mobile ports when you could just use the ROM on an EMU that you know will work?
To each their own, I suppose.
You did not mention Genesis/MD but it has many great games as well.
Also note the emulators made by this dev are paid but considered the best by many.
https://play.google.com/store/apps/details?id=com.explusalpha.MdEmu
I'm using MD.emu. Not sure which one is currently the best, but I paid for it awhile ago, so it's the one I use. So just a heads up, it is $5, but so far it seems to work fine.
Hope the link works. I'm on mobile, and it sometimes seems wonky.
I use all of the .emu emulators, so I use this one:
https://play.google.com/store/apps/details?id=com.explusalpha.MdEmu&hl=en_US&gl=US
What emulator did you end up going with? MD.emu? https://play.google.com/store/apps/details?id=com.explusalpha.MdEmu ?
You could try and use another emulator standalone one may help you could try MD.emu https://play.google.com/store/apps/details?id=com.explusalpha.MdEmu
You can play the original Genesis version through an emulator if you'd like. I don't know of any Columns native apps though. Here's a Genesis emulator I recommend if you're going to go that route.
EDIT: Found a few Columns games built natively for Android if you'd prefer that.
This is what I used for genesis. https://play.google.com/store/apps/details?id=com.explusalpha.MdEmu&hl=ja