CHEATING:
Cheating within the Arena is not permitted. DMs who suspect a Player of cheating will report him to all the Arena moderators and the admin, for review.
Invisible Castle: The DM of a match or tourney will specify which campaign names you must use when rolling for your character. Once you make a roll on invisible castle, you cannot re-roll it if you are not satisfied with the roll. If you made a mistake in your roll, consult your DM to ask him how he wants to handle this; In most cases, the DM will just keep the current result of the d20, and just fix the 'adjustments'.
DM Issues: If you think the DM handling your Match is unfair to you, contact him via PM to ask about the situation - there might be something you are not aware of, which explains the DM's ruling. If you really beleive the DM is in the wrong, do this: Send a Private Message to all the Moderators of the Arena, including your DM and the admin (you can select more than one recipient for a PM). Explain exactly what you beleive is the issue, as clearly as possible. The Moderators will review it between themselves, and send back a decision/recommendation which the DM & players must follow.
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Please review this + append changes + apply it to the main rules ( i might have forgotten something...

THANKS!
Richard