In this picture you can see the weird daily challenge button and I am also hovering over it with the mouse but if I reach the right part of the window or the bottom the mouse dissapears and I can't click on that part. After doing some more testing I found out that the weird daily challenge button occures only in 1600x900 but the mouse doas not work in resolutions 1600x900 and higher. Otherwise the game is realy good! :)