The result was that roller coasters filled with guests routinely flew off the tracks, and plummeted to the ground, killing all the passengers when the coaster crashed on the ground. However, he built it right on the edge of the other park's property, and of course, he put a high speed hairpin turn right on the border. One of the brothers realized that the quickest way to riches was to half-build an ultra-high, and ultra-dangerous roller coaster that had a significant mortality rate. When a guest fell off a roller coaster and died, the park he died in lost points. So ethics aside, there was a financial argument for having a safe park (as one would hope).

That had bad publicity and cost money, of course.

While super high roller coasters increased the number of guests that wanted to pay to ride it, and were more profitable, they were also less safe, and had more guests hurt of killed. One of the game rules was that if a guest to the park died or was injured, the player lost money and points from it. Of course, at a certain number of guests, there's not enough parking, so it was basically a game of logistics. The two theme parks were next to each other, so they were basically competing for the number of guests. The two kids, brothers, played against one another. I think it was RollerCoaster Tycoon that some friend's kids played at Lex Luthor levels of sociopathology.

Parkitect game rollercoaster crash