Razed now run the first one week challenge to hit certain multipliers on Hacksaw gaming providers. Unfortunately someone have won the Rotten games, so there are only Rip City and Sixsixsix that still available. Let's go participate if you're interested. 
Where can I find about these challenge on the site? I tried to find it but I find nothing unfortunately. Usually casino provide separated page for such challenge, but I dont find a tab namely challenges at Razed.
One more thing is that the winners need to claim the reward manually by sending message to live support, it would be nice if it can be an automatic rewarding system so anyone who hit it the challenge will get the reward instantly without contacting support.