Reorder levels and chapters into a better sequence

levels/bisect/bisect

@@ -0,0 +1,42 @@
+title = Yellow brick road
+cards = checkout commit-auto reset-hard bisect-start bisect-good bisect-bad
+
+[description]
+
+(Please zoom out a bit using your mouse wheel! :D)
+
+Oh no! You have lost your key at some point during the day!
+
+Sure, you could look at every single commit in an attempt to find it - but there's a better way: your time machine has a built-in way to find the point in time where things went wrong quickly!
+
+First, play the "bisect start" card. Then, go to a commit where you don't have the key, and play the "bisect bad" card. Likewise, go to a commit early on where you have the key, and play the "bisect good card".
+
+After you've found the last good commit, reset the main branch to it. What happened to the key after you lost it?
+
+[setup]
+
+echo "You still have your key." > you
+
+for i in {1..60}; do
+    if test $i -eq 18; then
+        echo "Your pocket is empty." > you
+        echo "Is on the ground." > key
+    fi
+    if test $i -eq 19; then
+        echo "Is holding a key in its beak." > bird
+        rm key
+    fi
+    if test $i -eq 20; then
+        rm bird
+    fi
+    git add .
+    git commit --allow-empty -m "$i"
+done
+
+[win]
+
+test "$(git log --pretty=%s main | head -1)" -eq 17
+
+[congrats]
+
+Well done! :) The only problem is that you now have to walk all the way back home, again...