- You can see from your indentation this function has turned into a callback nightmare; 
- You can take the event listeners out of the function and have them at the top of DOM, you just need to change the event listener so it listens to events on the game div for example; 

        ('#game').on('mouseenter', '.column', function(){
				$(this).css("background-color", "#A6977B")
			}).on('mouseleave', '.column', function(){
				$(this).css('background-color', 'white');
			})