However, the difficulty is easy to tweak from ‘pretty trivial’ to ‘maximum brainpower required’, so that can also help kids who understand the rules but not the strategy to play it without frustration (or for adults who don’t want the puzzle to be too intense). It’s easy to understand how the rules work overall, and actually playing is quite simple, but there’s a little more complexity than it appears at first – a few fiddly things to remember that will just put it a little out of the reach of younger kids. It'll take around 40 minutes to an hour to play – more players will mean more time.