hours of fun for 3 year old

Over the past year, my son has spent well over twenty hours playing this game. It is superb and surprising in depth and detail. For example, the bulldozer and backhoe can start digging anywhere, even on the road and break up the pavement. My son would like an area with all the machines, but the machines are well grouped to work together in each area. I CANt beleive this is free, and I would pay.

Solomon88k about Machine World, v1.6.2