Add cli hints to the first three levels

levels/branches/branch-create

@@ -7,6 +7,10 @@ You were invited to two parties! At one of them, your favorite band is playing -
 
 To make it easier to tell which timeline is which, you can create time portals! (We call these "branches".)
 
+[cli]
+
+Branches also make it really easy to travel between different places using the command line! As soon as you have a branch called "birthday", you can type `git checkout birthday` to travel to it!
+
 [setup]
 
 echo "You wrap the birthday present, and grab your concert ticket." > you

levels/branches/checkout-commit

@@ -9,6 +9,12 @@ The grey panel below shows your current environment - click on an object to insp
 
 Can you find out what happened here? Then, while on the latest commit, edit the files to fix the problem, and make a new commit!
 
+[cli]
+
+To checkout a specific commit, type `git checkout`, then a space, and then right click on the commit you want!
+
+This will insert the commit's unique identifier!
+
 [setup]
 
 echo "This piggy bank belongs to the big sister.

levels/branches/fork

@@ -7,6 +7,18 @@ Did you know that creating parallel timelines is perfectly legal and safe? It's
 
 Can you find out when things went wrong in this zoo, and create a parallel universe where everyone is happy?
 
+[cli]
+
+The blue animal represents a concept known as the "HEAD pointer" in Git: It shows you which commit is the current one.
+
+Here's a cool trick to go to the previous commit: 
+
+    git checkout HEAD^
+
+You can also go back two commits by typing, for example: 
+
+    git checkout HEAD~2
+
 [setup]
 
 mkdir cage

levels/branches/grow

@@ -9,6 +9,12 @@ First, you can directly travel to the commit, like we've done it before.
 
 And second, you can travel to the branch label. In this case, when you make a new commit, the branch will grow with you, and still point at the end of the timeline!
 
+[cli]
+
+To travel to a branch, type `git checkout name_of_the_branch`.
+
+And to travel to the last commit, type `git checkout --detach name_of_the_branch`.
+
 [setup]
 
 echo "You wrap the birthday present, and grab your concert ticket." > you

levels/files/files-delete

@@ -8,6 +8,12 @@ Full of excitement you open the door just to find... spider webs! Spider webs ev
 
 Remove all the spider webs you can find with the remove card!
 
+[cli]
+
+On the command line, you can easily delete all files ending in -web using this command:
+
+    rm *web
+
 [setup]
 
 echo A tiny spider web is next to your window. > tiny_web

levels/intro/commit

@@ -9,6 +9,12 @@ Here, let's practice this!
 
 (Your teacher pours some water into a glass.)
 
+[cli]
+
+Again, instead of using the card, you can also type the commands which are printed on it into the black terminal below!
+
+This is totally optional! But this will be a super useful skill in the real world - and it will give you a sparkling golden badge! :)
+
 [setup]
 
 echo "The glass is full of water." > glass

levels/intro/init

@@ -5,10 +5,13 @@ cards = init
 
 You've been accepted to time travel school! Yay! It's your first day! Your teacher explains:
 
-"To do anything with a time machine, you first need to initialize it! Go ahead, try it!"
+"To do anything with a time machine, you first need to initialize it!"
+
+Drag the blue card up to play it!
 
 [cli]
-Instead of playing a card, you can slo type 'git init' directly into your terminal!
+
+Instead of using the card, you can also type `git init` into the black box below, and press the enter key!
 
 [setup]
 

levels/intro/remote

@@ -1,14 +1,20 @@
 title = Working together
-cards = clone checkout commit-auto pull push
+cards = clone commit-auto pull push
 
 [description]
 
-Let's add your name to our list of students!
-
-I already have this list my time machine - let's work together!
+Let's add your name to our list of students! I already have this list my time machine - let's work together!
 
 Drag the "clone" card to my name to make your own copy of my timeline!
 
+[cli]
+
+To clone the teacher's repo via the command line, you need this command:
+
+    git clone ../teacher .
+
+(Don't forget the dot at the end!)
+
 [congrats]
 
 Welcome to time travel school! :) I'll see you for your first class tomorrow!