The only X you can press on mobile games is the X you press on the app's window after pressing back, which you will be doing after playing the generous time of one hour you can play the game for free before being forced to spend money for more time or currency. Minus forced ad time watching on that hour, that is.

Don't know about you but i've been pressing X a lot on mobile by closing fucking ads. And that's whan you open any of them and you have network connection. App don't even need to be a game at this point.