diff --git a/examples/python/tutorial/jupyter/guide.ipynb b/examples/python/tutorial/jupyter/guide.ipynb
index eeadc6447..27c1b60df 100644
--- a/examples/python/tutorial/jupyter/guide.ipynb
+++ b/examples/python/tutorial/jupyter/guide.ipynb
@@ -1074,7 +1074,7 @@
    "source": [
     "# Puzzles\n",
     "\n",
-    "Dog, Cat and Mouse\n",
+    "## Dog, Cat and Mouse\n",
     "\n",
     "Consider the following puzzle. Spend exactly 100 dollars and buy exactly 100 animals. Dogs cost 15 dollars, cats cost 1 dollar, and mice cost 25 cents each. You have to buy at least one of each. How many of each should you buy?\n"
    ]
@@ -1108,7 +1108,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Sodoku\n",
+    "## Sodoku\n",
     "\n",
     "<p><a target=\"_blank\" href=\"http://www.dailysudoku.com/sudoku/\">Sudoku</a>is a very popular puzzle. The goal is to insert the numbers in the boxes to satisfy only one condition: each row, column and 3x3 box must contain the digits 1 through 9 exactly once.\n",
     "    \n",
@@ -1213,7 +1213,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Eight queens\n",
+    "## Eight queens\n",
     "\n",
     "\n",
     "The eight queens puzzle is the problem of placing eight chess queens on an 8x8 chessboard so that no two queens attack each other. Thus, a solution requires that no two queens share the same row, column, or diagonal.\n",