Incessant problems with this game – KenKen Classic Review

Sometimes it works fine, and sometimes it goes nuts. It insists on writing in wrong numbers, and won’t respond to key presses. Restarting the iPad sometimes fixes this, but never for long; deleting and re-installing the game makes no difference. The problem seems to have started with iOS 12.2.
Review by Pfmfl on KenKen Classic.