As we don't have a physical keyboard or joystick or D-pad, we have to emulate one on the screen. One control scheme does this with two buttons on the screen for our game—one to go left, and one to go right. Another way is to allow for the differences in how a swipe might occur—a slow movement when our ship is not in danger, or a sudden movement when we need to avoid an obstacle in a hurry. Another method would be to simply link up the touch position on the screen to the ship—essentially our finger would have to trace the path through the cave. For smaller devices this might be fine, but for larger devices, it is better to go with some other method.