Arrowkeys to control, 'space' to swap places ball/square, 'ctrl' to reset game. The objective of the game is to collect all yellow balls by moving the blue ball. When you move in any direction, you will keep moving until you hit something. You have to use the square to block your path, press 'space' key to swap position. D-Star is a remake of an old game, originally written by Joe Wingbermuehle.