Changing the value in the Seed field will generate the corresponding input to the Input field.
By setting the N field to a value ≥ 2, you can change the input to the specified N value. This ignores the constraint range, which may be useful for manual play.
Pressing the Download button will download the inputs for seed values seed, seed+1, ..., seed+#cases-1 at once.

By running your program locally against the generated input and pasting the output of your program into the Output field, the visualization results will be displayed.
Pressing the ▶ button starts animation.
By checking the manual mode checkbox, you can play manually using keyboard input.
By pressing the Save as PNG or Save as Animation GIF button, you can download the visualization results.
Your score and PNG image for Seed=0 (without changing N) can be shared on twitter during the contest. Please check the problem statement for details.

The darker colored segments represent the largest tree.
Pointing the mouse cursor over a tile displays the current coordinates and the coordinates in the initial layout as a tooltip.
In rich mode, random noises are added to distinguish tiles of the same type.