Double Digger is a multiplayer reincarnation of the classic Digger concept, although one person can still play this new release. In the game, the players guide a small bulldozer through underground levels, in the process gathering gems, avoiding baddies and freeing gold bags for points or for dropping them on enemies' heads.
Cluster is a freeware puzzle game I've written. In this game you drive a bulldozer and your job is to push blocks around so that they all touch eachother. Sounds easy, but there is a catch. Once blocks touch, they fuse together, making them tougher to move around the oddly shaped rooms. Cluster comes with 50 challenging levels, and a level editor, for you to make and share your own levels.