i thought it would be sooo cool if we had a roller coaster building, riding app. you build a coaster, pick speeds, cars, jumps and more! then when your ready you click on the station and you start to hop in. you can go overhead view or for more 3-D, you can get a straight forward view as if inside the roller coaster looking ahead. you dont need money to buy roller coaster track, you just build as much you want. you can get mountains, waterfalls and other obstacles! id buy this for even 20.00$! i think this would be a rally cool app idea! and itd probably be the most popular!