Created by Frontier, the creative team behind the beloved Rollercoaster tycoon 2 & 3 games, have really outshined the competition with this amazing Theme Park game. A huge amount of scenery items allows you to create almost any themed rollercoaster you can imagine. And the graphics are some of the best I've seen on any simulator.
Only downside is that it does need a mid to high end graphics card for the game to be actually playable. Don't go off the minimum specs. Recommended specs of NVidia GTX 980 (4GB)/AMD R9 380 (4GB) or higher are best.