Lurkers.io

Lurkers.io is a free multiplayer sandbox with serious mod support. The base game is a top-down shooter, but the engine lets communities host their own servers and write custom game modes in a scripting language. Popular servers cover everything from zombie survival to pure deathmatch to co-op dungeons.

How to play

Browse the server list, pick one that matches your mood, and join. Each server has its own rules and objectives. If you can code, hosting your own server is a few clicks away.

Tips

Try a few servers before picking a favorite — variety is the whole point
Popular servers have regulars; join a community for better matches
If you script, start with a small mod — tweak an existing one
Don't expect built-in balance — mods define their own rules