Real Minecraft in Portal 2: Steve, build and break blocks, Minecraft textures, sounds, and mobs—all from your own Minecraft.
How to join The host picks "Play Cooperative Game", chooses standard co-op and double-clicks a Steam friend to invite them; the friend accepts the Steam invite. 2 players. Everyone playing needs this mashup from Melty.
Portal 2 is the game — and Minecraft is really in it, not rebuilt block-for-block. You play Portal 2's chambers, but as Steve, with real Minecraft blocks, textures and sounds read from the Minecraft you already own.
Nothing from Minecraft is shipped in the mod. It is read from your own copy of Minecraft every time you play, the same way the game itself uses it.
Melty installs this into your Portal 2 and launches it straight into a Minecraftised test chamber. On Play it reads the Minecraft you own and builds the blocks, textures and sounds from it.
Requires Portal 2 and Minecraft: Java Edition.
Everything here is Portal 2's own game plus your own Minecraft content. No Minecraft files are included in the download.