What is the best part in Build-a-lot

Well, personally I really like the latest Build-A-Lot 4 power source myself. Same great game play as the other Build-A-Lot games but includes a new twist by adding power / electricity to the picture.

If you want to see more of the game, there is a full video walkthrough series over at Chewy Central (see direct link down in the related links section of the answer) where you can see each level and see if you would like this game.