Where is the treasure hunt levels gone ?

Batgirl

Where is the treasure hunt gone ? The treasure levels are not their it was the last time i played 60 and something  hours for playing it and now its gone. Can you tell me what happened? 

KingsPinn

I thought it was a timed event but it looks like they took it down. I saw a few people on here saying it was crashing so maybe they had to change something.