Here is ours.
Step 1: Dicide on Parts
Then some books, for good measure.
Then a wheel down a inclined plane.
Then a ring slide.
To the hotwheel tracks.
Then some dominoes.
To a car. Then a catapault. Then a rollercoaster.
To a marble run to a cup. Then pour the food.
Step 2: Many Steps or Few Steps
Here they all are in order.
Pull pulley. Which knocks books over. To hit wheel down ramp. To hit ring slide. To hit marble. To hit dominoes which hit mousetrap to release car which launches catapault. To throw ball to hit mousetrap. That releases rollercoaster to hit marble run which knocks marble down run into cup. Cup slides down hitting dominoes. Setting off mousetrap to tip cup to pour the dog food. PHEW!
Step 3: NOW MAKE YOUR OWN AND VIDEO IT!!!
Try to use as many steps possible making sure it works alright.