I've hosted one of these event before and I'm not sure if I'd call it hide and seek, but its riddles that you solve ingame, places to find, npcs, hidden toons, keys etc.
Currently the prizes are
1st place: 23c
2nd: 100 primos
3rd: 100 gems of your choice; Kings/Ametrine/Cardinal
Join the discord to see how last event was structured. Its not easy.
https://discord.gg/YAjm2JaUrQ
On icecrown
