This is just a fun little game you can play. The object of the game is where you play with another person. One person hides something in a recent post on any topic, and the other person tries to find it. You can add prizes if you want, but it is not required. It goes something like this:
User 1: I challenge User 2
User 2: I accept!
(Then user 2 hides somethings in a recent post on any topic)
User 2: I hid a :D in a recent post.
(Then user one tries to find it)
I'll start. I challenge @SmilingSnowflakes!