At the second snow level (L5OH), there will be a screen with a Whar'ork on a Ice platform and two ice platforms on the right side of the screen. Kill the bad guy, and climb up to the top platform. walk to the next stage, There will be a Rock creature on the ground, and a Gragg with wasp bombs(purple one) at a high ledge right side. Kill the Gragg and use a bridge key to get accross.
Use a levetator just about where the bad guy's body is and you see a ledge in an above screen. Line up the levetator just right and you can get up to the ledge and climb up.
Walk to the left to the next screen and you will find
the 3 Lost Vikings!! (from the game ''The Lost Vikings'').
Enter SJ5Z as a password.