Free WYSIWYG Gameboy Game Studio
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GB Studio by Chris Maltby
https://chrismaltby.itch.io/gb-studio
A quick and easy to use drag and drop retro game creator for your favourite handheld video game system
GB Studio is a visual game builder with no programming knowledge required allowing you to make real Game Boy ROMs in minutes. You can run the games on any emulator or you can run them on your Game Boy if you've got a flash cart!