Unsure if you are aware of sport challenges that we are running every week, they are posted on every Monday in Sportsbook Promotions section in forum. (https://forum.stake.com/board/230-sportsbook-promotions/)

One is big Multi Master challenge with a prize of 1.15 BTC and with every week when no one catches the main prize we are increasing prize pool by 0.05 BTC. You can find more information about it on this link: https://forum.stake.com/topic/32892-%F0%9F%8F%86-115-btc-multi-master-go-big-or-go-home-week-6-%E2%9A%BD/

Second one is bit different and requirements are being changed every week, prize pool can go up to 0.08 BTC depending on the amount of winners. More information about that one to be found on this link: https://forum.stake.com/topic/32876-%F0%9F%8F%86-008-btc-shooters-touchsports-challenge-%E2%9A%BD/

If you have any question regarding them please let me know.