Here’s an idea for keeping your kid away from video games for a while ― make a stop-motion short.
Watch a killer robot suspense flick I’ve made with my nephew (8 years old):
He designed the robot, made the (hardly visible) blood effects and it was also his idea that the burned skeleton should keep his hard hat on.
In the middle of the shooting my son (3 years old), the creator of the tower, suddenly decided to remove it from the scene. I used the green tint to hide the fact and it worked as well as you might imagine.
Captured with EyeToy (Cheese app in Linux Mint 17), laser effects added in MS Paint, composed in ImageReady.