Instructions
Visit Powerminers.lego.com in your Web browser and load the "Rock Rocket" game. After a short video advertising LEGO's Power Miners, you'll be able to click "Start Game."
Click the gray trapezoidal tab on the bottom of the "Rock Rocket" game window. This opens a window with five colored crystals.
Click on the crystals to change their colors. Click each of the five crystals until their color order matches the following pattern: Blue, Blue, Green, Yellow, Yellow. Click the arrow button next to the crystals to submit the code. The message "Boulderac Unlocked!" will appear below the game title.
Click "Start Game" to load the monster selection screen. Click the left arrow to highlight Boulderax and click the forward button to begin the game.