The command system relies on key letters. Submit N to go north, E to go east, S to go south, W to go west, and have the letter F in the command to fire in any of those directions. When you fire, the arrow will land 3 caves from your position in the direction you choose. If you hit the Wump, you win.
Based on an ancient video game (as in, made in 1978) that has a name that Scratch's "bad word detector" flags for some reason Modified to make it more simple, consistent, realistic, and replayable.