The format is a 3-hour timed contest which you may start at any time today or tomorrow. We tried to make the difficulty level a bit higher than the real CCC so we won't disappoint contestants who did well on this practice contest.
You can find the contest here (Senior is harder, Junior is easier): http://wcipeg.com/contests
So far, nobody has gotten a perfect score on the Senior contest yet. Can you do it? (Confession: actually, the main reason for me posting this contest here is because I spent a lot of time preparing Senior #5, and nobody solved it.)
In case you don't have a wcipeg account but you have a DMOJ account or would like to try upsolving the problems after your timer ends, the contest will also be at DMOJ.
Thank you for your attention!