Challenge is not multiplayer.. Challenge allows you to challenge someone, the challenge is sent and then they accept the challenge in their own time. Afterwards, the result is sent back to both players via email. I think that true split screen multiplayer games like this.. especially flash, are a quite a ways in the future.
I think he means almost like ghosting the other player which is pretty easy to do and is what I used in an older racing game that I deleted...
Or he could mean using Flash Com Server and or Electrotank to host multiplayer sessions at a time good for both people which is like synth said, probably way in the future...
For the ghosting, all you have to do is make it so that the ghosting file contains the grade on each note such as perfect and then you can build the "replay" from that while the other person is playing...
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