1. Every game runs, untouched
The world game launches as normal and keeps its quests, NPCs and saves. The other games launch beside it with their windows hidden. None of them is rewritten.
Pick a world and as many games as you want to play it with. Tell Gamoo the crossover, and it writes the mods that run them as one.
Gamoo is napping until your beta wave opens. Your mashups will live here, so try a template in the meantime.
Single-player PC games with an active mod loader. Games that need kernel-level anti-cheat or always-online play aren't supported.
The pass-through method
This is the technique behind every "Minecraft in another game" clip going round right now. Gamoo automates the hard part: writing and wiring the mods, whether you combine two games or ten.
The world game launches as normal and keeps its quests, NPCs and saves. The other games launch beside it with their windows hidden. None of them is rewritten.
A plugin for each game's mod loader (SKSE, Fabric, ModEngine and friends). They trade collision, camera, combat and geometry through shared memory every frame.
The guest's blocks and characters are injected before post-processing, so they pick up the host's sun, shadows and fog instead of looking pasted on.
Reading your prompt
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Pick the world
This game runs and draws everything you see.