Reddit reviews Baby Gate Magic Gate for Dogs, Indoor Outdoor Retractable Baby Gate, Portable folding Mesh Dog Gate, Extra Wide Baby Safety Gate and Pet Gate for Stairs, Doors, Extends up to 40.4'' X 29.5'' (Black)
We found 3 Reddit comments about Baby Gate Magic Gate for Dogs, Indoor Outdoor Retractable Baby Gate, Portable folding Mesh Dog Gate, Extra Wide Baby Safety Gate and Pet Gate for Stairs, Doors, Extends up to 40.4'' X 29.5'' (Black). Here are the top ones, ranked by their Reddit score.
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I know which topic you're talking about. It might not be the exact model but it does look similar.
Maybe something like a utility pouch? I feel like you could find something clear, or mesh, so you can see/hear the Game Boy easier.
Maybe there's a cell phone pouch designed for a Blackberry or Palm Treo that could hold the GBC?
https://www.amazon.com/CAMTOA-Multi-Purpose-Military-Utility-Tactical/dp/B018XOHTDA/
Something like that.