Work on the intro and the index chapter

levels/files/files-delete

@@ -1,10 +1,11 @@
 title = Unexpected Visitors
-cards = checkout commit-auto reset-hard file-new file-delete
+cards = file-new file-delete
 
 [description]
 
 *ring ring* Oh no! You wanted to meet with your parents in your student apartment and your alarm did not go off in time to clean your room!
-"Coming!" you yell while you jump out of bed. Now quick! Remove all litter and trash you can find by using `rm [file]` and commit your changes.
+
+"Coming!" you yell while you jump out of bed. Now quick! 
 
 [setup]
 
@@ -12,14 +13,17 @@ echo Very smelly socks. > socks
 echo A tiny couch table. > table
 echo An empty energy drink can. > can
 echo An empty bag of chips. > bag_of_chips
-git add .
-git commit -m "weekend"
 
 [win]
 
-NUM_FILES="$(git ls-tree --name-only -r HEAD | wc -l)"
-test "$NUM_FILES" -eq 1 && test "$(git ls-tree --name-only -r HEAD)" = "table"
+# Remove all litter and trash.
+! ls | grep bag_of_chips &&
+! ls | grep can &&
+! ls | grep socks
+
+# But make sure to keep important things!
+ls | grep table
 
 [congrats]
 
-Your parents are happy to see you (and of course your neat and tidy apartment)!
+Your parents are happy to see you (and, of course, your neat and tidy apartment)!