Level 4.11 bonus isn't available

Okay I am missing something. I got all gold on all the levels and it won't let me in to the 4.11 bonus level. Does anyone have any suggestions on what I might have missed?

I'm having the same issue. Sure do wish someone would clear this up for us!

Did you find the puzzle piece?

You need to collect all ten of the puzzle pieces, and then complete the jigsaw for the level (I think 4 is the Hesperides) before you can access level 11.
Hope this helps.