In the Museum, hold L1+R1 and press Up, Right, Down, Left three times. If done correctly, a pickaxe icon will appear.

Now, enter the Tower of Druaga exhibit halls. Go directly forward untill you bump into a wall. Pac-Man will indicate there's something there. Press X and he'll dig through the wall. You'll see a 3-D battle between Gil and Druaga, and a new Tower of Druaga to play.

Play the game GALAXIAN until you clear round 9. After you've done this, press TRIANGLE during the demo sequence to access the options window. Choose "Option" and you'll find a new option called "Rank". This allows you to change the game from "Normal" to "Hard" mode.

Play the game GALAXIAN until you have a high score of 30,000 points or more. Once you've done this, press the TRIANGLE button during the demo sequence to access the options window. Highlight "Test" and press X; then, when the test screen appears, press TRIANGLE to open the test screen options window. Highlight "Dip SW" and press X, then highlight swith #6 and press UP to turn it on. Now start the game and you'll be playing in Psychidelic Mode, in which all moving objects leave trails of colored lights on the screen.

Load the game GALAXIAN. When the demo sequence begins, press SELECT exactly 32 times to add credits. When the number of credits shown in the lower right corner of the screen is 32, press the SELECT button one more time and hold it down while pressing START. Now you're playing in Turbo Mode, in which the game speed is many times faster than the original.

Go to the Test menu (press TRIANGLE to bring up the menu, then go to Test) Now press TRIANGLE again to access the menu, and choose dipswitches. Put dipswitch #1 on and then return to the main game. Re-access the menu, and you'll see a new option called "Course." Click on course and a tone will sound.

Start a game, and although the diagrams of the tracks look normal, they have drastically changed! (Check out the Test track!)