I am sure some of you know about this already, but there is this cool FREE program on-line called "magic pen." It is similar to the crayola physics, but it is also FREE and can be used on a Mac. It's based on things you draw and you have to move your object to a flag. You basically use physics to get it there. It definitely is challenging and gets you thinking. There are a bunch of sites it is on if you google it, so not sure which is best and which we use. My DS4 (and DH) LOVE it and there is even a Magic pen 2.
