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Double-checked the card.. when I swapped in a different bios, it was misnamed. Put the real CDZ bios back in place with the right name.. worked like a charm. I'd never seen the NGCD bios startup before.  Both versions of the game work now.

Double-checked the card.. when I swapped in a different bios, it was misnamed. Put the real CDZ bios back in place with the right name.. worked like a charm. I'd never seen the NGCD bios startup before.

I have the bios on an SD card, and still get a white screen.  I even tried the plain NGCD bios, CDZ, and even unibios.

How did you get it to play without the white screen covering the playfield on Polymega?

Same issues with 1.1

That's the only version the Polymega semi-officially supports. They even check hashes.  I even tested with unibios for CD and CDZ, same result.  From what I've found, they use a modified version of MAME for Neo-Geo CD support.

I did have the CDZ BIOS on my SD card. Tried it with and without. Same result both ways.

I tried the CD version on a Polymega with their BIOS and one sideloaded (NeoGeo CDZ), and got a mostly white screen.  This even covers the playfield in-game. Is there something that I could've done wrong?

Check out MetroidCrime playing through the demo of Lifelike in between Sonic 1 speedrun practice.  https://www.twitch.tv/videos/1106981900