the game will only select 4:3 screen ratio (1024x768) to bypass this go to your Worms Mayhem Bottle (~/Library/Application Support/CrossOver Games/Bottles) look for launcher.cfg inside (drive_c/Program Files/Codemasters/Worms 4 Mayhem/) and edit the (W:) and (H:) values. Save the file then run program. Remember not to change the window select on the launcher ( this will overwrite what you just saved). Have fun playing!