Is Operation Genesis the RTS / theme park sort of game? I always wanted to play this but had no clue it was so difficult to procure.
I also played and really enjoyed a Super Nintendo Jurassic Park game (I always remember getting stuck at a point in the "main command center" area, that involved hacking elevators or rebooting the computer systems). I never got far in it but I chalk that up to being a young gamer unable to really "figure out" puzzles. For an SNES game it was actually a bit open world, though with roadblocks that required a bit of puzzle solving or proper ordering of events and actions.
Another game on the SNES that I ALWAYS got stuck on, for similar reasons and which I also forgot the name of was an EXCELLENT Star Trek game - different worlds, but sort of similar playstyles. The ST game involved Next Generation crew, it had a ship combat mode that was sort of like Starfleet Command in perspective, but real time; and more interactive. The game allowed the player to send down away teams of NG "mains" on missions. Totally off topic, but the mission I always got stuck on (again, young gamer "puzzle-itis") was one that involved reprogramming a computer by sliding around tiles on a massive board... ever play those old "hand held" ;) puzzle games, where you moved around ACTUAL wooden tiles you held in your hand??? It was like that, but in a video game! Anyway, this rant has now devolved into something that belongs in the Drunk thread ;) Good luck on getting the game added, and if anyone knows the original SNES games I mentioned I'd LOVE the official names!