Bubble Drill is a very fun and addictive game that allows you to have fun by grouping together bubbles with the same color. When you do that, they explode and disappear from the world.
You must save your world by allowing the drill to push down the roof up to a mark without the bubbles touching your bottom section of the screen.
It has the best combination you can expect from a great game: cheap, addictive, fun and nice graphics!