Modlands

Modlands is a action-adventure sandbox with a multiplayer editor that can edit anything in the game. Make maps and mods with your friends. Build anything you want.

You can change the art, properties, and scripting of anything and everything. Download popular mods with the in-game mod browser, and share your own creations.
Edit the art of anything and everything with the in-game sprite editor!
Animations, effects, sounds, and all kinds of other assets are also editable in realtime multiplayer!
Build farms and industry! Conveyor belts automatically receive food from harvestable plants next to them; pick up and move plants using your shovel, and start a farming empire!
Hook up triggers to impulse tiles to create traps, gadgets, and automation in level design! You can even create your own items to act as triggers and react to stimuli in novel ways!