BlameThePixel!

Ok, perhaps not entirely new

http://www.thechallengebase.com has opened up now that the beta is released!
Basically, TCB contains several custom made challenge that van vary between a bungeerace to battling it out with a CPU with a predefined map and scheme.
Any challenge may be tried at any time and you may report more than just once for each report to try to make your personal record even better.

Check it out! And be sure to check the FAQ section and read the challenge description! We've had to deny reports because of people not doing this

I have tried two so far and failed miserably.. lol. Some of them obviously need some persistence.

Also I signed up earlier but I think I accidentally deleted the confirmation email. (I have got into the habit of using shift+delete on my emails lately so I couldn't even get it back). So I can't validate myself :s

One word in the shoutbox would have been enough!

Problem solved, activated your account manually.