diff --git a/server/leanserver/GameServer/FileWorker.lean b/server/leanserver/GameServer/FileWorker.lean
index a705bf4..1d1af42 100644
--- a/server/leanserver/GameServer/FileWorker.lean
+++ b/server/leanserver/GameServer/FileWorker.lean
@@ -72,7 +72,7 @@ def compileProof (inputCtx : Parser.InputContext) (snap : Snapshot) (hasWidgets
   let (tacticStx, cmdParserState, msgLog, endOfWhitespace) :=
     MyModule.parseTactic inputCtx pmctx snap.mpState snap.msgLog couldBeEndSnap
   let cmdPos := tacticStx.getPos?.getD 0
-  if Parser.isEOI tacticStx then
+  if Parser.isTerminalCommand tacticStx then
     let endSnap : Snapshot := {
       beginPos := cmdPos
       stx := tacticStx
diff --git a/server/leanserver/lake-manifest.json b/server/leanserver/lake-manifest.json
index b2e4207..1e31dae 100644
--- a/server/leanserver/lake-manifest.json
+++ b/server/leanserver/lake-manifest.json
@@ -1 +1 @@
-{"version": 4, "packagesDir": "./lake-packages", "packages": []}
+{"version": 4, "packagesDir": "lake-packages", "packages": []}
diff --git a/server/leanserver/lean-toolchain b/server/leanserver/lean-toolchain
index 1060ced..c76d115 100644
--- a/server/leanserver/lean-toolchain
+++ b/server/leanserver/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:nightly-2023-01-16
+leanprover/lean4:nightly-2023-01-29
diff --git a/server/testgame/TestGame/Levels/Induction/L01_Simp.lean b/server/testgame/TestGame/Levels/Induction/L01_Simp.lean
index 0abb0fa..8eef726 100644
--- a/server/testgame/TestGame/Levels/Induction/L01_Simp.lean
+++ b/server/testgame/TestGame/Levels/Induction/L01_Simp.lean
@@ -36,6 +36,8 @@ lemma sum_const_add (n : ℕ) : (∑ i in Fin n, 0) = 0 := by
 Mit `simp?` anstatt `simp` kannst du zudem schauen, welche Lemmas von `simp` benutzt wurde.
 "
 
+open BigOperators
+
 Statement
 "Zeige dass $\\sum_{i = 0} ^ {n-1} (0 + 0) = 0$."
     (n : ℕ) : (∑ i : Fin n, (0 + 0)) = 0 := by
diff --git a/server/testgame/TestGame/Levels/Induction/L02_Sum.lean b/server/testgame/TestGame/Levels/Induction/L02_Sum.lean
index 3c08230..224ec3c 100644
--- a/server/testgame/TestGame/Levels/Induction/L02_Sum.lean
+++ b/server/testgame/TestGame/Levels/Induction/L02_Sum.lean
@@ -25,6 +25,8 @@ vom Typ `Fin n`, das heisst, man muss diesen eigentlich immer mit `(i : ℕ)`
 als natürliche Zahl verwenden.
 "
 
+open BigOperators
+
 Statement
 "Zeige dass $\\sum_{i=0}^{n-1} (i + 1) = n + \\sum_{i=0}^{n-1} i$."
     (n : ℕ) : ∑ i : Fin n, ((i : ℕ) + 1) = n + (∑ i : Fin n, (i : ℕ)) := by
diff --git a/server/testgame/TestGame/Levels/Induction/L03_Induction.lean b/server/testgame/TestGame/Levels/Induction/L03_Induction.lean
index ba5b7cf..108c0a8 100644
--- a/server/testgame/TestGame/Levels/Induction/L03_Induction.lean
+++ b/server/testgame/TestGame/Levels/Induction/L03_Induction.lean
@@ -29,6 +29,8 @@ Für den Induktionsschritt braucht man fast immer zwei technische Lemmas:
 
 -- Note: I don't want to deal with Nat-division, so I stated it as `2 * ... = ...` instead.
 
+open BigOperators
+
 Statement
 "Zeige $\\sum_{i = 0}^n i = \\frac{n \\cdot (n + 1)}{2}$."
   (n : ℕ) : 2 * (∑ i : Fin (n + 1), ↑i) = n * (n + 1) := by
diff --git a/server/testgame/TestGame/Levels/Induction/L04_SumOdd.lean b/server/testgame/TestGame/Levels/Induction/L04_SumOdd.lean
index e35e16b..e796abd 100644
--- a/server/testgame/TestGame/Levels/Induction/L04_SumOdd.lean
+++ b/server/testgame/TestGame/Levels/Induction/L04_SumOdd.lean
@@ -15,6 +15,8 @@ Introduction
 Hier nochmals eine Übung zur Induktion.
 "
 
+open BigOperators
+
 Statement
 "Zeige folgende Gleichung zur Summe aller ungeraden Zahlen:
 
diff --git a/server/testgame/TestGame/Levels/Induction/L10_Bernoulli.lean b/server/testgame/TestGame/Levels/Induction/L10_Bernoulli.lean
index 8828b15..02e4c0b 100644
--- a/server/testgame/TestGame/Levels/Induction/L10_Bernoulli.lean
+++ b/server/testgame/TestGame/Levels/Induction/L10_Bernoulli.lean
@@ -16,6 +16,7 @@ TODO: Induktion (& induktion vs rcases)
 
 "
 
+open BigOperators
 
 example (x : ℕ) (n : ℕ) : 1 + n * x ≤ (x + 1) ^ n := by
   induction' n with n hn
@@ -33,10 +34,11 @@ example (n : ℕ) : (∑ i : Fin (n + 1), ↑(2 * i - 1)) = n ^ 2 := by
 Statement
 "Zeige $\\sum_{i = 0}^n i = \\frac{n ⬝ (n + 1)}{2}$."
   (n : ℕ) : (∑ i : Fin (n + 1), ↑i) = n * (n + 1) / 2 := by
-  apply hh1
-  induction' n with n hn
-  simp
   sorry
+  -- apply hh1
+  -- induction' n with n hn
+  -- simp
+  -- sorry
   -- rw [Fin.sum_univ_castSucc]
   -- simp [nat_succ]
   -- rw [mul_add, hn]
diff --git a/server/testgame/TestGame/Levels/Induction/T00_Sum.lean b/server/testgame/TestGame/Levels/Induction/T00_Sum.lean
index f6b3b58..be78477 100644
--- a/server/testgame/TestGame/Levels/Induction/T00_Sum.lean
+++ b/server/testgame/TestGame/Levels/Induction/T00_Sum.lean
@@ -14,6 +14,7 @@ Introduction
 "
 "
 
+open BigOperators
 
 Statement
 "Zeige $\\sum_{i = 0}^n i^3 = (\\sum_{i = 0}^n i^3)^2$."
diff --git a/server/testgame/lake-manifest.json b/server/testgame/lake-manifest.json
index d5603ab..3f13d49 100644
--- a/server/testgame/lake-manifest.json
+++ b/server/testgame/lake-manifest.json
@@ -1,34 +1,10 @@
 {"version": 4,
- "packagesDir": "./lake-packages",
+ "packagesDir": "lake-packages",
  "packages":
  [{"git":
-   {"url": "https://github.com/xubaiw/CMark.lean",
-    "subDir?": null,
-    "rev": "2cc7cdeef67184f84db6731450e4c2b258c28fe8",
-    "name": "CMark",
-    "inputRev?": "main"}},
-  {"git":
-   {"url": "https://github.com/leanprover/lake",
-    "subDir?": null,
-    "rev": "d0b530530f14dde97a547b03abf87eee06360d60",
-    "name": "lake",
-    "inputRev?": "master"}},
-  {"git":
-   {"url": "https://github.com/leanprover/doc-gen4",
-    "subDir?": null,
-    "rev": "09dbebed9ca85368152bb5146ef6f1271b1be425",
-    "name": "doc-gen4",
-    "inputRev?": "main"}},
-  {"git":
-   {"url": "https://github.com/mhuisi/lean4-cli",
-    "subDir?": null,
-    "rev": "5a858c32963b6b19be0d477a30a1f4b6c120be7e",
-    "name": "Cli",
-    "inputRev?": "nightly"}},
-  {"git":
    {"url": "https://github.com/leanprover-community/mathlib4.git",
     "subDir?": null,
-    "rev": "98bc5f26ea463d9583f601c84518c95643c0ea14",
+    "rev": "774069a73cae9148d941b09c267b465d3f7d7737",
     "name": "mathlib",
     "inputRev?": "master"}},
   {"git":
@@ -40,31 +16,13 @@
   {"git":
    {"url": "https://github.com/JLimperg/aesop",
     "subDir?": null,
-    "rev": "645e92db52499582bb31984396a5e41772241012",
+    "rev": "ccff5d4ae7411c5fe741f3139950e8bddf353dea",
     "name": "aesop",
     "inputRev?": "master"}},
-  {"git":
-   {"url": "https://github.com/hargonix/LeanInk",
-    "subDir?": null,
-    "rev": "2447df5cc6e48eb965c3c3fba87e46d353b5e9f1",
-    "name": "leanInk",
-    "inputRev?": "doc-gen"}},
   {"path": {"name": "GameServer", "dir": "./../leanserver"}},
-  {"git":
-   {"url": "https://github.com/xubaiw/Unicode.lean",
-    "subDir?": null,
-    "rev": "6dd6ae3a3839c8350a91876b090eda85cf538d1d",
-    "name": "Unicode",
-    "inputRev?": "main"}},
   {"git":
    {"url": "https://github.com/leanprover/std4",
     "subDir?": null,
-    "rev": "04b3c9831e0c141713a70e68af7e40973ec9a1ff",
+    "rev": "cda27d551340756d5ed6f9b83716a9db799c5537",
     "name": "std",
-    "inputRev?": "main"}},
-  {"git":
-   {"url": "/home/jeugster/Documents/Lean/duper",
-    "subDir?": null,
-    "rev": "d0fb397d96483c90969c725ad5ea307cc02bdf7d",
-    "name": "duper",
     "inputRev?": "main"}}]}
diff --git a/server/testgame/lakefile.lean b/server/testgame/lakefile.lean
index 98ba429..9ea11dc 100644
--- a/server/testgame/lakefile.lean
+++ b/server/testgame/lakefile.lean
@@ -6,12 +6,6 @@ require GameServer from ".."/"leanserver"
 require mathlib from git
   "https://github.com/leanprover-community/mathlib4.git"@"master"
 
-require duper from git
-  "/home/jeugster/Documents/Lean/duper"@"main"
-
---set_option tactic.hygienic false
---set_option autoImplicit false
-
 package TestGame
 
 @[default_target]
diff --git a/server/testgame/lean-toolchain b/server/testgame/lean-toolchain
index 1060ced..c76d115 100644
--- a/server/testgame/lean-toolchain
+++ b/server/testgame/lean-toolchain
@@ -1 +1 @@
-leanprover/lean4:nightly-2023-01-16
+leanprover/lean4:nightly-2023-01-29