I was a bit ambiguous for electronically supported games. But if I see that my two children thus can employ almost one hour myself, I can only recommend it.
You play it but only at level 1 (ie 1 magic door). Stages 2 and 3 are them too stressful, they prefer to play 3 times in a row stage 1 and are happy.
Funny to mention is perhaps even more that the children sometimes are so excited to catch the Pebble and that concerning the discussions. Strategy sometimes very loud.