$12256 / $11500
this may seem like a dumb question. i know the art here can be used for games but does that include mods and rom hacks? edit: im working on a rom hack related to a sega game they are ok with rom hacks now. people can upload them to steam. if you want more info heres an old article. http://www.polygon.com/2016/4/28/11530338/sega-genesis-rom-hacks-steam-w...
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As long as you follow the license of the art you should be fine. I would stay away from CC-BY-SA or GPL licensed assets for this project. CC-BY may give you problems, if there is some kind of DRM in the Sega Master System on Steam. You would want to figure that out.
But OGA-BY or CC0 licensed assets should be fine, just make sure you include attribution for OGA-BY.
If something has multiple licenses, (e.g. it lists both CC-BY-SA and OGA-BY), you can pick one license and ignore the rest. So in this example, you could use it under the terms of OGA-BY.