The objective of the game is to count, although, you cant just write the number down in your post. You have to respond with a picture showing a number of objects equal to the value of the number you are going to count to.
Like so:
Here we have a picture of one flying bus, the next poster have to post a picture of two objects, for example Mudkip or Kittens.
The count restarts to one after the number 10, but it has to be a new picture.