Input a Layout file from a Sonic decomp and input it into the Layout File list, watch the magic happen. This ONLY supports layouts in the Sonic 3 format. (So only Sonic 3/&K levels are supported!) This doesn't have every level chunk available, you'll need to extract them via SonLVL for that. I'm not publishing the link, ToS reasons.
Sonic Decomp - Ice Cap Zone Act 1 Layout File
