Fantastic Contraption
and
Fantastic Contraption 2
are
online Physics Puzzle Games. You build machines to move one or more goal objects to the goal area.
The games are free to play, you get a few levels and
FC2 has a free level of the week. For $10 you get all the levels, the
Level Editor, and user-created levels.
Fantastic Contraption and Fantastic Contraption 2 provide examples of: