Kept you waiting, huh? MGSV stealth missions and a skateboard in Minecraft, with the music from your own MGSV.
Open the iDroid, pick a mission and drop into a guarded outpost. Soldiers see and hear you, and the base shifts through Sneak, Caution, Alert and Evasion with Metal Gear Solid V's own phase music and the "!" sting, read from your installed copy of MGSV.
Two missions: Over the Fence (extract a prisoner) and Brass Hat (knock out and extract a commander). Single player.
Needs Minecraft: Java Edition and Metal Gear Solid V: The Phantom Pain (installed). Nothing from MGSV ships with the mashup and nothing in your MGSV folder is changed. On first start, sign in to Minecraft once in the Prism window; in game, press I for the iDroid.
Credits: Prism Launcher (GPL-3.0), Fabric API (Apache-2.0), vgmstream (ISC-style), a Java port of GzsTool by Atvaark (MIT) and CityHash (MIT). The mashup's own code and art: MIT.