my 18mo is very into putting things together.
He currently enjoys jigsaws (2 pieces, which he can do), building blocks, those peg jigsaw things, and train carriages which he loves putting together.
Things like stacking cups etc are not enough for him - he likes to sit and work things out and for it to be a bit tough.
can anyone recommend anything else that involves putting things together, or in or on iyswim?