Mashup, Play, lobby, coding agent

Short definitions Melty uses: mashup, Play, invite link, verified upload, Claude Code, Codex, uninstall restore.

Melty is a free Windows desktop app from Stella Montis Inc., backed by Y Combinator. The public landing still shows Download, How it works, and FAQ only. This hub exists so search engines and AI crawlers can open a clean HTML/Markdown URL for the topic.

Mashups run on games you own. Play downloads the mashup, installs what it needs, and starts the game. Uninstalling puts every file back. Multiplayer mashups get an invite link. You can publish your own mashup by pasting Melty instructions into Claude Code or Codex.

Download the Windows app, press Play on a mashup, and keep or share the lobby link if the mashup is multiplayer. If a required game is missing, Melty opens that game's store instead of pirating a copy.

• Mashup A mod that joins games into one. SkyCraft: play Skyrim as a Minecraft player.
• Mod On Melty, usually a mashup or a verified modification you start with Play.
• Lobby A multiplayer mashup session. Private, friends, or public.
• Invite link The URL Melty copies after Play on a multiplayer mashup (demo shape /j/amber-fox-7k2q).
• Play button Downloads the mashup, installs what it needs, starts the game.
• Coding agent Claude Code or Codex. You paste Melty instructions; it builds and publishes.
• Claude Code Named coding agent on the Melty FAQ for making mashups.
• OpenAI Codex The other named agent on the Melty FAQ.
• Verified upload An upload checked for dangerous files.
• Game library The owned, installed games Melty can start. Melty is not the store.
• One-click install Play performs download + install + launch.
• Uninstall restore Uninstalling puts every file back as it was.
• Public lobby An invite link opened beyond a private friend list.
• Private lobby Invite link kept to people you choose.
• Desktop launcher Melty is a Windows desktop app, not a cloud stream.
• Stella Montis Inc. Company on the Melty footer. © 2026 Stella Montis Inc.
• Y Combinator The landing shows Melty as backed by Y Combinator.
• Press Play The landing headline action: In one click.
• Owned games Hard requirement. Missing games open their store.
• Dangerous files What Melty's upload check looks for. Report leftovers from the mashup page.
• Publish Ship a mashup so others can Play it.
• Discover In-app shelf of mashups (SkyCraft, Super Mario Ring, and the rest).