Revvin' Dragster

The Revvin' Dragster is an educational wind-up type toy which is incorporated with some sort of game for cooperative play. The targeted age group will depend on the game.
Simply pull the car back to wind it up and when the child lets it go not only does the car move but the meter on the front raises based on how far back the child pulls the car as well.
The toy can be constructed using a universal wind-up toy gear box and will be relatively durable and safe due to few exposed moving parts.