What kinds of game mods are listed on Unmoddable?

Unmoddable is a directory site that catalogs mods which change how many people can play a game — most often adding multiplayer or co-op to singleplayer titles, and in the other direction adding singleplayer content to multiplayer games. It also lists self-developed tools, modding tutorials, and related resources. If you are looking for a way to play a singleplayer game with friends, or to find solo content in a multiplayer game, this is the type of site to check.

Multiplayer and co-op mods for singleplayer games

This is the site's main focus, and the listings show a consistent pattern: a singleplayer game gets a mod that lets two or more people share the same world or campaign.

Examples from the site's catalog:

• Clair Obscur: Expedition 33 – Online Expedition Multiplayer: adds real-time multiplayer to the RPG, letting friends explore Lumière together, appear as fully animated players in the world, and team up for cooperative battles.
• Graveyard Keeper 2 Multiplayer Mod: brings online co-op to the graveyard management adventure, supporting up to eight players in the same world. Each player keeps their own character, inventory, and progression while working together on construction.
• Hades Co-op Mod: adds local and online cooperative multiplayer for two players, designed with minimal gameplay changes, and supports local split controls and Steam Remote Play.
• Rain Meadow (Rain World): a multiplayer and co-op mod that lets players complete Story mode together online, compete in Arena battles, or explore the peaceful Meadow area.
• MegabonkTogether (Megabonk): online co-op for up to six players over peer-to-peer netplay, synchronizing core systems such as enemies, weapons, projectiles, chests, shrines, portals, and progression.
• Dark Messiah Co-op: turns the original singleplayer campaign into a cooperative adventure, with shared campaign saves, persistent character skills, and new co-op features.
• CardShopCoop (TCG Card Shop Simulator): a co-op mod for the shop management sim where you stock shelves, manage inventory, set prices, organize tournaments, and collect rare cards.

The common thread is that these mods preserve the original game's structure — progression, saves, or campaign — while adding other players to it. That matters if you care about not losing your existing progress when you start playing with others.

Singleplayer mods for multiplayer games

The site also covers the reverse case: mods that add singleplayer or solo content to games built around multiplayer. The catalog description states this as an explicit category, so if a multiplayer game has a mod that lets you play its content alone, it belongs here.

Self-developed tools, tutorials, and other resources

Beyond mod listings, Unmoddable includes:

• Self-developed tools — utilities the site or its community has built, rather than third-party mods.
• Modding tutorials — guidance for creating or installing mods.
• Other related resources — the site describes its scope as covering these categories generally, so the catalog is not limited to finished mod downloads.

How to use the listings to decide

Each entry gives you enough to judge fit before installing:

If you want to play a specific singleplayer game with friends, search the catalog for that title first. If it is not listed, the site's tutorials and tools sections are the next place to look, since the catalog is explicitly a work in progress ("we try to list all").