Click on the tiles to turn them over one by one, but they will only disappear if you get a pair. See how quickly you can make the whole grid disappear :^D By the way, it will show you the grid for 5 seconds at the start so try to remember as much as you can Everything apart from some of the tile art by @SpontaneousGames , and the rest was just graphics from the library.
Enjoy! Also, if you want me to change anything, just leave a comment.