In which I'm constructing two car rides ...
RollerCoaster Tycoon® 2 - Triple Thrill Pack: http://store.steampowered.com/app/285330/
Stretch your imagination further to build bigger parks and higher coasters! Break ground and start from scratch, open the gates to a remarkable Six Flags park, or just create the most gut-wrenching roller coaster imaginable - now you can play your way! Choose and complete different scenarios accordingly to the experience and content you like. Satisfy the visitors by building various attractions and facilities. Wild new rides, exciting new themes, and improved easy-to-use building tools make creating the ultimate amusement park more fun than ever!
OpenRCT2 project: http://openrct2.org/
OpenRCT2 is an open-source re-implementation of RollerCoaster Tycoon 2 (RCT2), expanding the game with new features, fixing original bugs and raising game limits. The gameplay revolves around building and maintaining an amusement park containing attractions, shops and facilities. The player must try to make a profit and maintain a good park reputation whilst keeping the guests happy. OpenRCT2 allows for both scenario and sandbox play. Scenarios require the player to complete a certain objective in a set time limit whilst sandbox allows the player to build a more flexible park with optionally no restrictions or finance.
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Intro + outro details: http://pixelwitchplays.tumblr.com/intro