One Block Online!

You spawn on a single block that regenerates over time as you break it. Once you have enought blocks you bridge to a portal spawned somewhere near the one block. The portal leads to more portals which are from other people's! Going through other people's portal brings you to their island were you can't break anything (Adventure mode). Once you break your one block enought times it will uprgade phases to a different biome. The more phases you go the more blocks you need to mine to get to the next phase.