RollerCoaster Tycoon 3 ($5) — While an unabashedly freemium version of RollerCoaster Tycoon 4 has been on the App Store for a while now, we’re quite thrilled to see the original developer bringing the classic version to the iPhone and iPad as a “purchase once” option with no in-app purchases. The iOS version of RollerCoaster Tycoon 3 remains faithful to the original, adding only a new mobile-friendly UI to the classic gameplay.…