Use the arrow keys to drive your digger.

You must watch your gas and temperature gauges!

You will need to upgrade your digger before you can get very deep. (There are rumors there may be Underground Jam at the core of the planet). To buy items at the Upgrade Store, click on the price of the item.

Press the Space Bar twice while you are at the Gem Store to sell the current contents of your diggers inventory (the minerals you mine while you are under ground).

Good Luck!