Return to Blockland, commonly abbreviated as RTB, is a modification for Blockland. RTB expands on the feature set of Blockland by allowing you to download add-ons in game, chat with other players over IRC and allows additional server control for server hosts. You can read a more detailed list of the features here.

RTB also provides a number of services outside of the game, including a wiki to help new players and an add-on hosting service.