There are multiple ways to accomplish this. There are adding random turns; or moving random distances; or finding a corner and zig-zagging across the rows or columns; or finding a corner and counting steps across and down to spiral in toward the middle. I am quite sure there are even more ways. Some ways take longer than others; but all can be done with the standard one grid square moves or eat per each act step. How you want your wombat to transgress the grid will determine what kind of code you will use. Before anyone can help in this matter, you will need to both (a) post the current code you have in your Wombat class and (b) indicate which method of transgressing you require your wombat to have.