Very very high data use. Edit mar 2022: somehow it now uses and even more incredable ammout of data, 1.2gb a month. Edit Jan 2021: now even higher. This app used over 500mb of data in one month. I've calculated that it somehow takes about 6mb of data per move you make. This equates to almost an hour of HD video from YouTube, except that it doesn't even usually play a video add after each move, just a static image with an impossibly small close button.