Changing the value in the Seed field will generate the corresponding input to the Input field.
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 pressing the Save as PNG button, you can download the visualization results.

You can quickly switch between multiple outputs by pressing the Select File button at the top and selecting the directory containing the output files.
By naming the output file 1234.txt or abcd_1234.txt, the seed number (in this case 1234) is automatically set when the file is selected.

At each operation, the output of your program is displayed in the Query field, the response from the tester is displayed in the Response field, and the comment that was output at the time just before that output is displayed in the Comment field.
For details on how to use the comment function, please refer to the problem statement.
Hovering the mouse cursor over each square will display its coordinates in a tooltip.
Checking "Show Answer" will display the correct positions of each oil field and draw the boundary lines of each oil field in green.