Is Challenge Park open on Sunday's during Halloweekends?

I was there yesterday and it looked empty from Magnum. Is it closed on Sundays?

https://www.cedarpoint.com/hours-directions/challenge-park

Sunday, October 19, 2014
12:00 PM - 8:00 PM

It looked empty yesterday. There was nobody at mini-golf, go karts, Ripcord or Skyscraper. I thought maybe it was closed, but I guess it wasn't.

It's cold and dead, not that hard to believe. Who wants to walk all the way back there in the cold?

I went on RipCord for my first time yestarday, but there weren't many people over there.