Apparently "Complete Saga" had multiplayer
/confirm
I clicked multiplayer from the little menu inside the cantina, and it connected me with some random dude who had finished everything. My save suddenly unlocked 13 billions studs + the achievement (which remained when I went back to singleplayer), and he showed me around everything he unlocked.
I don't think multiplayer (aside from split-screen) is available on PC, though, only on console versions.
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A while back I was trying to forget around with the Indiana Jones 2 level editor. I got to increase the maximum parts, change the size of the building level, add more parts and do some pretty nifty stuff. I'm thinking of going back and finding how to share levels.