Just wanted to highlight this to the group - I did a search and this did not appear to be mentioned for the past year. My DD8 loves this so don't be put off by the 'middle school' appellation - not on this board, at least. My DD loves any graphic novels and she adores puzzle. Try it with your kids!
It is not 'in yer face' Maths at all so kids that have Maths anxiety or kids that have managed to convince themselves that they are bad at Maths could surprise themselves and get a real confidence boost from this game I would think, too