Sorry if this isn't the right place for a thread like this, but I've tried many search queries and I can't find what I'm looking for, so I'll see if anyone around here knows what I'm referring to.
It was an adventure map, sometime between 2012 and 2015. It was a puzzle/adventure scenario that had a lobby in the center and 3 different paths, one made of gold blocks, another of iron blocks, etc. At the end of each path there would be a lever to flip to signify its completion. When all 3 were flipped, the final area would open up.
That's unfortunately all I can remember. All I know was that it was many years ago and I had a ton of fun playing it.