After beating cerberus, im stuck. The arena says closed.?

I finished Alice in Wonderland World. And Tarzan World. Now I'm stuck. I already beat cerberus. The arena says closed now. Then I do the barrels. Both of them (easy, advanced) but after that nothing new happens. Do I have to beat my before record? After I finish the barrel challenge hercules just says "can't wait!" And Phil offers me the barrel challenge AGAIN! I'm confused help, PLEASE!!!