I’ve written up a multiplayer tech demo using the Rune SDK and ThreeJS (and Kenney assets :)).
It’s got a simple world, a character controller fit for mobile games and uses the Rune SDK to let multiple players explore the world together.
Open source here: rune/tech-demos/threejs at staging · rune/rune · GitHub
Details here: Three.js Tech Demo
Try it here: Rune - multiplayer web games