• Connect the signal from the source blocks to the sink blocks of the same color. Source is arrow pointing up, sink is arrow pointing down
• The signal for each color needs to reach their sink at exactly the same time
• Every signal has a quality score, the quality goes up if there's a signal in a neighboring pixel and down if there's timing or distance mismatch.
• Click a source or sink to set the drawing color.
• Middle mouse button samples a color from an existing pixel
• Right click to switch to clearing pixels

Load a level:

• Corner
• Swaparound
• Wrap-5

Or change the game itself:

• #editor
• Source code