The Bungeling Empire has stolen a huge cache of gold from its rightful owners, and your mission is to infiltrate its treasury and recapture it. This entails progressing through 150 screens of platforms, ladders and ropes.
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The Empire has sent robotic guards down to protect the gold, and contact with any of these will cost you a life. Your method of escaping them is to press fire to dig a hole in their line of movement, thus causing them to fall in briefly, allowing you to move across the gap safely. Once all the gold has been collected, a ladder allowing you to move onto the next screen is added. Completing these screens often requires forward planning and precision.
This was one of the earliest games to include a level editor, allowing the creation of new level designs with no programming skill.