Ones that aren't too serious with a lot of violence. Preferably ones that have an educational undertone but where the kids don't realize they are actually learning something while having fun. While I don't have kids, I know this topic has come up before in my family & I was always at a loss as to what to say. What do you suggest?
Super Mario Galaxy comes to mind. It has lower gravity in some places, a lot of enemy variety, and some really good orchestrated music. Spyro has different physics-related things like paper airplane mechanics while gliding and then actual plane flight levels, and velocity and momentum-based air movement after a supercharge (running) to reach high or far places.