Santa brought Claire and Mya magnatiles for Christmas. They are by far the best building toy I've ever seen. Both kiddos sit for hours playing, building, fighting knocking over towers and starting all over again. They are pretty incredible. I purchased the 100 piece set, but it is pretty apparent that we need more. 100 is definitely appropriate for one, but there just aren't enough tiles for two kiddos to share and each build larger towers/buildings. I actually got the idea for this gift from their school. I have picked Claire up on a number of occasions only to find her working intently on building some massive structure. Mya's classroom has also acquired a set and she too, is loving them. I am on the hunt for another, but I may need to donate a kidney to pay for them. ;)