so right click on the game (not the zip) and select open package contents. after that open contents folder and the mac os folder. there will probably be a page icon if that is the page icon it wont work so go into terminal type chmod +x then copy and paste the icon thing into there (with a space separating the chmod +x) if it worked then the paper icon will now be a screen with a word exec i think and then you can run it. open system preferences and go into security and privacy. to the general tab it will say at the bottom about not letting it open. press open anyway.