Straight from Game Freak, the creators of Pokemon, this obscure gem for the Gameboy Advance came in the form of a large cartridge that came with it's own battery-less rumble pack.
Drill Dozer's story is simple enough. It stars a band of lovable rogue thieves known as the Red Dozers. Their nemesis is a group known a the Skulkers. One day, grade school age Jill returns home to find that the Red Dozer's base has been ransacked by the Skulker gang. Her father has been injured and her precious treasure, a red jewel she received from her late mother, has been stolen.
Taking charge of the situation, Jill hops into the eponymous Drill Dozer, a miniature mecha that turns its hands into a drill, Jill sets off to get her mother's jewel back and kick some Skulker tail.
The gameplay of Drill Dozer is a bit on the slow side, as you're piloting a rather clunky machine. Much of the gameplay centers around using your drill in various inventive ways. The drill can spin left and right by pressing the L and R buttons, and you use this in various ways such as unlocking combination locks.
The Drill Dozer starts out only being able to drill for a few seconds, but once you find the second gear, you can boost it one stage further for more power. When you find the third gear, the world is your oyster and you can keep the drill spinning infinitely, charging through enemies like pudding. But at the end of each stage, the gears break and you're back to base power.
Drill Dozer is a fun, obscure game that REALLY needs some kind of porting, like virtual console or something.