According to the TSF manual, the story is that Jazz, Spaz and Lori go on vacation, visit an easter planet, a haunted house and a turtle city and then find the key to Valhalla (which is actually just a password to get some user levels on the now-defunct Project 2 website.) However, J2O mentions it was originally called Diamond Edition, and I recall reading somewhere that there might have been a better plot involving diamonds, hence the box-art.

Oh, and does anyone bother to find out how Holiday Hare '95 fits into continuity?