Mashups: putting one game inside another

In September 2026 a wave of AI-built mashups went viral: skateboarding in MW2, Minecraft inside Skyrim, Elden Ring and Mario 64, Black Ops 2 inside Minecraft. They use four patterns. Pick the lightest one that delivers the idea, and plan the oracles before writing code: these projects fail by drifting, not by lacking code.

Pattern 1: port the content (lightest)

Bring an enemy, weapon or block type into the host as new host content that imitates the guest. Examples: "Claude added creepers to Dark Souls", Minecraft blocks as Elden Ring items.

• Read the guest's behaviour from its source of truth: decompile or read the wiki's exact numbers (speeds, timers, damage). Reimplement it in the host's mod API (host AI state machine, host projectile).
• Assets: never copy the guest's files into your mod. Convert them from the user's install at runtime or install time (a converter script), or recreate lookalikes with fal.
• It's cheap and robust, with no IPC. It works with any host that has a loader.
• Worked converter: Bloons TD 6 assets (Unity 6) to a private Minecraft resource pack, see knowledge/games/minecraft/bloons-td-6-in-minecraft.md and asset-pipeline section 6.