8BitMMO is a retro 2D sandbox from Archive Entertainment, built by essentially one full-time developer. The whole world is made by players: houses, castles, towns and dungeons are placed block by block in one shared world that streams in without loading screens.

You can found a town and become its mayor, with tools for managing residents and land, and anti-griefing systems protect what people build. Enemies are more joke than threat, such as lawyer cats and lobbyist slugs, and you can even turn into a zombie and infect others. Paid items are cosmetic, like hats, and give no advantage.

It suits players who like building and relaxed socialising. The community is small, and updates are rare: recent news is mostly player meetups and technical fixes.