I don't know all the details but soka said they have a multi player for one of these
http://www.minecraftforum.net/topic/191908-ctmcollection-vechs-super-hostile-series/
They are an adventure kind of thing, with a goal in mind as well.
Not sure if we could somehow adapt the single player version so that people could complete the victory monument individually or not. But this is what it says under the ones designed for multiplayer:
SUPER HOSTILE RACE FOR WOOL #01
HOSTILITIES BEGIN
Current version: 1.1
Download
My first multiplayer Super Hostile map. Two teams race against each other to complete a miniature Victory Monument! They play on mirror-image lanes, and can shoot at each other, and also trigger traps that will go off on the enemy teams lane! Please be sure to read the included README file for full details and rules.
SUPER HOSTILE RACE FOR WOOL #02
DIRECT FIRE
Current version: 1.1
Download
My second multiplayer Super Hostile map. Two teams race against each other to complete a miniature Victory Monument! This map is more heavily focused on direct combat than the first RFW map, and has many TNT cannons and bow and arrow supplies to blast the other team. Please be sure to read the included README file for full details and rules.