In this game, three things from the same category are listed. The object is to rate them by stacking them together, with your favorite on top. For instance, I might list:
Space Mountain, Magic Mountain and IT's A Small World
Then, the next poster would stack them according to preference. - for example:
It's A Small World
After doing so, they would choose three things for the next poster to rank by stacking. All categories are acceptable. Be as creative as you wish..