diff --git a/ocr-numbers.json b/ocr-numbers.json
new file mode 100644
index 0000000000..4d422480aa
--- /dev/null
+++ b/ocr-numbers.json
@@ -0,0 +1,187 @@
+{
+  "#": [
+    "An expectation of  -1 indicates that a failure should be raised"
+  ],
+  "convert": {
+    "description": "Converts lines of OCR Numbers to a string of integers",
+    "cases": [
+      {
+        "description": "Recognizes 0",
+        "input": [
+          " _ ",
+          "| |",
+          "|_|",
+          "   "
+        ],
+        "expected": "0"
+      },
+      {
+        "description": "Recognizes 1",
+        "input": [
+          "   ",
+          "  |",
+          "  |",
+          "   "
+        ],
+        "expected": "1"
+      },
+      {
+        "description": "Unreadable but correctly sized inputs return ?",
+        "input": [
+          "   ",
+          "  _",
+          "  |",
+          "   "
+        ],
+        "expected": "?"
+      },
+      {
+        "description": "Input with a number of lines that is not a multiple of four raises an error",
+        "input": [
+          " _ ",
+          "| |",
+          "   "
+        ],
+        "expected": -1
+      },
+      {
+        "description": "Input with a number of columns that is not a multiple of three raises an error",
+        "input": [
+          "    ",
+          "   |",
+          "   |",
+          "    "
+        ],
+        "expected": -1
+      },
+      {
+        "description": "Recognizes 110101100",
+        "input": [
+          "       _     _        _  _ ",
+          "  |  || |  || |  |  || || |",
+          "  |  ||_|  ||_|  |  ||_||_|",
+          "                           "
+        ],
+        "expected": "110101100"
+      },
+      {
+        "description": "Garbled numbers in a string are replaced with ?",
+        "input": [
+          "       _     _           _ ",
+          "  |  || |  || |     || || |",
+          "  |  | _|  ||_|  |  ||_||_|",
+          "                           "
+        ],
+        "expected": "11?10?1?0"
+      },
+      {
+        "description": "Recognizes 2",
+        "input": [
+          " _ ",
+          " _|",
+          "|_ ",
+          "   "
+      ],
+      "expected": "2"
+      },
+      {
+      "description": "Recognizes 3",
+      "input": [
+        " _ ",
+        " _|",
+        " _|",
+        "   "
+      ],
+      "expected": "3"
+      },
+      {
+      "description": "Recognizes 4",
+      "input": [
+        "   ",
+        "|_|",
+        "  |",
+        "   "
+      ],
+      "expected": "4"
+      },
+      {
+      "description": "Recognizes 5",
+      "input": [
+        " _ ",
+        "|_ ",
+        " _|",
+        "   "
+      ],
+      "expected": "5"
+      },
+      {
+      "description": "Recognizes 6",
+      "input": [
+        " _ ",
+        "|_ ",
+        "|_|",
+        "   "
+      ],
+      "expected": "6"
+      },
+      {
+      "description": "Recognizes 7",
+      "input": [
+        " _ ",
+        "  |",
+        "  |",
+        "   "
+      ],
+      "expected": "7"
+      },
+      {
+      "description": "Recognizes 8",
+      "input": [
+        " _ ",
+        "|_|",
+        "|_|",
+        "   "
+      ],
+      "expected": "8"
+      },
+      {
+      "description": "Recognizes 9",
+      "input": [
+        " _ ",
+        "|_|",
+        " _|",
+        "   "
+      ],
+      "expected": "9"
+      },
+      {
+      "description": "Recognizes string of decimal numbers",
+      "input": [
+        "    _  _     _  _  _  _  _  _ ",
+        "  | _| _||_||_ |_   ||_||_|| |",
+        "  ||_  _|  | _||_|  ||_| _||_|",
+        "                              "
+      ],
+      "expected": "1234567890"
+      },
+      {
+      "description": "Numbers separated by empty lines are recognized. Lines are joined by commas.",
+      "input": [
+        "    _  _ ",
+        "  | _| _|",
+        "  ||_  _|",
+        "         ",
+        "    _  _ ",
+        "|_||_ |_ ",
+        "  | _||_|",
+        "         ",
+        " _  _  _ ",
+        "  ||_||_|",
+        "  ||_| _|",
+        "         "
+      ],
+      "expected": "123,456,789"
+      }
+    ]
+  }
+}
diff --git a/ocr-numbers.md b/ocr-numbers.md
index bb412ce9cb..7628d55f31 100644
--- a/ocr-numbers.md
+++ b/ocr-numbers.md
@@ -1,36 +1,74 @@
-## Step 1
+# Step One
 
-A simple binary font has been constructed using only pipes and
-underscores.
+To begin with, convert a simple binary font to a string containing 0 or 1.
 
-The number is four rows high, three columns wide:
+The binary font uses pipes and underscores, four rows high and three columns wide.
 
+```
      _   #
     | |  # zero.
     |_|  #
          # the fourth row is always blank
+```
 
+Is converted to "0"
+
+```
          #
       |  # one.
       |  #
          # (blank fourth row)
+```
+
+Is converted to "1"
+
+If the input is the correct size, but not recognizable, your program should return '?'
+
+If the input is the incorrect size, your program should return an error.
+
+# Step Two
 
-Write a program that, given a 3 x 4 grid of pipes, underscores, and
-spaces, can determine whether the the grid represents a zero, a one, or
-garble.
+Update your program to recognize multi-character binary strings, replacing garbled numbers with ?
 
-Anything else is considered garble, and can be represented with a '?'
+# Step Three
 
-## Step 2
+Update your program to recognize all numbers 0 through 9, both individually and as part of a larger string.
 
-A simple numeric font has been constructed using only pipes and
-underscores.
+```
+ _ 
+ _|
+|_ 
+   
+```
 
-The number consists of four rows high, three columns wide:
+Is converted to "2"
 
+```
       _  _     _  _  _  _  _  _  #
     | _| _||_||_ |_   ||_||_|| | # decimal numbers.
     ||_  _|  | _||_|  ||_| _||_| #
                                  # fourth line is always blank
+```
+
+Is converted to "1234567890"
+
+# Step Four
+
+Update your program to handle multiple numbers, one per line. When converting several lines, join the lines with commas.
+
+```
+    _  _ 
+  | _| _|
+  ||_  _|
+         
+    _  _ 
+|_||_ |_ 
+  | _||_|
+         
+ _  _  _ 
+  ||_||_|
+  ||_| _|
+         
+```
 
-There may be several numbers in the input text, one per line.
+Is converted to "123,456,789"