Nice, I fell for that for quite a while. Hmm, haven't been able to get this for 3 months and today got it second try. Not sure if it was persistence or luck. Quite a few paths to the exit but I didn't find the 31 obvious, I had to leave it and come back. I liked that, not too difficult but required some thought How any algorithm can think that's kindergarten beats me. I've played easier bachelor levels!!