They procedurally generated 1,500+ different iterations on top of the same Unity-based slots shovelware using noun/adjective pairs. The general success they enjoyed is as sad as it is hilarious. For the record, the most enticing descriptor categories were: "3D", "Luxury", "Casino/Gambling", and "Sexy".
You can pay to get an extra move or a take-back (only joking).
Actually thinking about it, there probably is a cheap chess clonelike app on mobile market that does that.