NNG progress

server/nng/NNG/Levels/Tutorial/Level_1.lean

@@ -28,7 +28,7 @@ Statement
   Hint "In order to use the tactic `rfl` you can enter it above and hit \"Execute\"."
   rfl
 
-NewTactic rfl
+NewTactic rfl simp -- TODO
 NewDefinition MyNat
 
 Conclusion

server/nng/NNG/Levels/Tutorial/Level_3.lean

@@ -56,9 +56,11 @@ Statement
   writing a small `←` (`\\l`, i.e. backslash + small letter L + space)
   before `h` like this: `rw [← h]`."
   Branch
-    rewrite [← h]
+    simp? -- TODO: `simp` should not make progress.
+  Branch
+    rw [← h]
     Hint (hidden := true) "Now both sides are identical…"
-  rewrite [h]
+  rw [h]
   Hint (hidden := true) "Now both sides are identical…"
   rfl
 

server/nng/NNG/Levels/Tutorial/Level_4.lean

@@ -50,6 +50,8 @@ Statement
   rw [add_succ]
   Hint "Now you see a term of the form `… + 0`, so you can use `add_zero`."
   Hint (hidden := true) "Explicitely, type `rw [add_zero]`!"
+  Branch
+    simp? -- TODO
   rw [add_zero]
   Hint (hidden := true) "Finally both sides are identical."
   rfl