I/O is a brain-teaser of a puzzle game along the lines of the fabulous Click Drag Type series that comes with no instructions. In fact, this puzzle was also designed by Simple Andy, the creative force behind Click Drag Type.
Use your skills of discovery, intuition and creative problem solving to figure out what must be done to arrive at a solution. You will have to click-drag the puzzle around since it will not all fit within the game window.
Hints and tips may be necessary, but please use spoiler tags when posting spoilers in the comments.