I can lose hours at very simple games as well, though. I put more hours into .io games than I'd like to admit. Maybe these games are so far mediocre because th

I can lose hours at very simple games as well, though. I put more hours into .io games than I'd like to admit. Maybe these games are so far mediocre because there haven't been many made yet, and most creative endeavors are mediocre. It doesn't mean that it's not possible to make an awesome memory-training game.