While playing, press F1 + F3 + F5. If done right, you should have 1 of all the powers. Keep pressing the keys to increase the numbers.
During the intro, press F2 and you'll be taken to the soundtest.
Easter egg: Insert the bonus disk (Disk 2) and start the erotic simulator. After the game has loaded, insert Disk 1 and lose the game. When the game tries to load back, instead of loading the digitized woman, it will load one of the hand drawn anime girls.