Possible Game engines for iPad
Pros: Free, Broken Aged used this engine.
Navigation: Swipe left and right (x axis) to move across the environment and up and down (y axis) at key locations to move in to and out of the environment (x axis).
Map of Greyton: Navigate through the environment (box’s) by swiping (x axis) and into new environments by scrolling (y axis).
Design Decisions: Keeping the navigation intuitive to touch screen, it is easier to swipe through the environment than click or use sudo arrow keys.