Manic Digger is an open-source implementation of block-building games as made famous by Minecraft. Manic Digger aims to be a generic platform ontop of which you can create your own game-types and scenerios. Through server-side scripting, any type of block-building game should be possible.
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That's really all I have to say on this lava lamp.
You know, if I wasn't smart enough to see the sign, I'd almost swear that thing is a giant d-
yeah, I'll just leave this image now.