Clarified format of answer.

debugging-1-unguided.md

@@ -8,4 +8,4 @@ The way the game is supposed to work is that the snake moves up, down, left, and
 
 As you'll see when you play the game, the snake does not move up, down, left, and right. It just seems to move diagonally, and when you press the arrow keys in certain directions, the game ends.
 
-**Find and fix this defect by working backwards systematically from the failure to the cause**. You have up to 15 minutes. Notify the experimenter when you're done.
+**Find and fix this defect by working backwards systematically from the failure to the cause**. You have up to 15 minutes. When you believe you've found the best fix, tell the experimenter which text on which line of code you changed (e.g., line 27, replace "hello" with "goodbye").