Every game you have mastered on RetroAchievements, laid out as a wall of box art.
MasteryHub is a free tool for RetroAchievements hunters. It reads the games a public RetroAchievements username has mastered and turns them into something you can actually look at and share: a mosaic of the box art for every set you have finished.
If RetroAchievements is new to you — it is a community project that adds achievements to retro games. You play through an emulator that talks to their servers, and unlocking achievements works much like it does on a modern console. Thousands of games, dozens of systems, run by volunteers and free to join at retroachievements.org.
Nothing needs to be installed and no account is created here. You enter a username, the masteries load, and the grid builds itself. It exports to a PNG, because the point of a collection is showing it to people.
MasteryHub is a fan project and is not affiliated with RetroAchievements.org. Game artwork and achievement data belong to their respective owners.