OK, my idea is to make a VERY large, separate underground tunnel and put clues leading to the next cave or something and the winner will find a chest at the end and win say, stack of gold?

What if people hack? ._.

Walmart voices my main concern. Very cool idea though!

or you could have the clues hidden all over minetown spawn

EXACTLY! Thanks mike <object class="emojione" data="https://resources.enjin.com/1489581540/themes/core/images/emojione/svg/1f600.svg?0" type="image/svg+xml" standby=":d">:d</object>

Walmart, I can agree......

But dont most hackers get banned?

By hacking do you mean x-ray?

Then simply have an admin cover it in lava or some kind of ore

Maybe have multiple chest. Some with different items in them...like dirt, eggs, coal, gold...etc

Chest in different locations.

I like the idea, I think there should be more than one winner though. Say maybe the first 10 who get to the chest wins something? x

Nice idea. I think top 5 compete for the positions a Winner and a Second place maybe

I am really looking forward to this if it occurs. If you wanted to really complicate it, you could have pressure plates and note blocks create a "Hotter, colder" type thing with the higher sound the closer. But that'd take ages <object class="emojione" data="https://resources.enjin.com/1489581540/themes/core/images/emojione/svg/1f61b.svg?0" type="image/svg+xml" standby=":p">:p</object>