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| Key | Action |
|---|---|
| '+' or '=' | Speed up the applet. |
| '-' | Slow down. |
| Ctrl+Shift+'R' | Restart |
| spacebar | pause |
The program will drop a grain of sand at the center cell in the n X n grid. Initially all the cells are pointed in the up direction. Everytime a grain of sand touches a cell the arrow the cell is pointing rotates clockwise. Grains of sand are routed via the direction of the cell arrow. Note a grain of sand is routed first then the arrow changes direction. A grain of sand moves until it finds a empty cell.
What do the colors mean:
If a cell is empty is has the color white.
If a cell is occupied and the arrow is pointing up, it has the color yellow.
If a cell is occupied and the arrow is pointing right, it has the color green.
If a cell is occupied and the arrow is pointing down, it has the color blue.
If a cell is occupied and the arrow is pointing left, it has the color red.
Colors are displayed after a grain of sand has moved into an unoccupied cell.