Not sure, I might not have it turned on correctly in the arcade software. All should be "challenegable". All you are doing is basically challeneging someone to play a game for whomever gets the highest score.
Like I challenge u to a game of pacman, and you accept we both play and submit our scores (it might take the first score only, not really sure) then whomever has the highest "wins" the challenge.
I thinK I still have to run some sort of a query to enable it, still checking with the support forums on it. When I get full info I will post more of what I got.
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