Selling 700,000 copies in its first year, the 1999 theme park strategy game RollerCoaster Tycoon helped keep its publisher Atari alive and kicking. Today [March 2024] is its 25th anniversary.
https://www.theguardian.com/games/2024/mar/22/rollercoaster-tycoon-at-25-its-mind-blowing-how-it-inspired-me