Work Zone is a Petscop fangame/parody engine, written in Godot. It is designed to have everything you need to make something out of the box, similiar to Pokemon Essentials, and in-game editors like Friday Night Funkin's Codename Engine, including but not limited to a 3D map editor.
It uses Godot Engine, and this retro shaders pack.
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Techman06's Openscop - This now-unavailable Petscop recreation engine inspired this one's existence. RIP.
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Creators of the Petscop megasheet - You can find their names in sprites/megasheet.png, where the megasheet itself is located. Though not entirely considered accurate anymore, it is a valuable asset for any Petscop fan-content.