USE THE LEFT AND RIGHT ARROW KEYS to cycle through the different possible instructions. Use Space to remove the instruction. Press the green button to run your program and the red button to stop it. You can change the speed at which it runs with the slider on the bottom right.
Credits to foxterfox for the original project. I took the background from bgfons.com/download/637. Thanks to Google for making the original AWESOME doodle ! ►►RUNS BETTER IN TURBO MODE◄◄