Requirements for continuing with Game Development 2 (Solved)


I think I solved all “levels” on Game Development. It says 14/14. I’d like to proceed with Game Development 2. The button is visible on the overview at

I can go to,
however, there is no flag active and I cannot play any level.

What need I do in order to continue?

Regards & Thanks for any hint.

Edit: After my clicking back and forth for writing this post, it does work now. So it probably it was a glitch or something that I did wrong in the beginning.