For those who don't know, the Topper for Stern's Jurassic Park represents a new idea in pinball. The topper contains the Jurassic Park logo, and when connected to your game it contains a new and exclusive mode where the player lights up individual letters in the topper to spell out Jurassic Park and activate a mode. (It just so happens that in this case the letters carry over from game to game like the RANSOM letters in Black Knight 2000.)
There is a video from Flip N Out pinball that (sort of) shows the mode:
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