What do you do on the "Challenge" spot in the game "Imaginiff"?

Question

I know two people are supposed to "match" but I don't know how it works exactly. I'll pick best answer right away if someone quotes the rules, or posts a link to the rules of Imaginiff. (By Buffalo...and yes, I've searched the Internet for this)

Answer 1

"Challenge Round

If the Player elects, on his or her turn, to move the Grey Token to the Challenge space as the roll of the die allows, a Challenge Round is played. The player whose turn it is picks one other player to participate in the Challenge Round. You cannot decline participation.  The Player then throws the die again and moves the Grey Token the indicated number of spaces in either direction. The Challenge round is now played using the name indicated by the Grey Token.

Only the Player and his or her chosen partner play this round. The card is read and the two players independently choose

their answers, using the Numbered Cards.  If they match, both players move forward 4 spaces. If not, they must both move

back 2 spaces. Players cannot move back any further than the Start Space."

Taken from - http://www.buffalogames.com/fileadmin/co...

Happy gaming!