diff --git a/levels/chapter_01.json b/levels/chapter_01.json
index f95a40e..4e6c18a 100644
--- a/levels/chapter_01.json
+++ b/levels/chapter_01.json
@@ -49,6 +49,7 @@
 			"id": "increment_input",
 			"name": "Incrementer",
 			"description": "Add one to each input number",
+			"init_board": "     \n o   \n 5   \n     \n *+  \n  M2 \n     \n     \n     \n",
 			"stages": [{
 				"input": [93, 47, 71],
 				"output": [94, 48, 72]
@@ -57,10 +58,29 @@
 				"output": [45, 128, 131, 212, 154, 157, 37, 197, 237, 237, 24, 57, 104, 206, 13, 50, 7, 42, 131, 60, 39, 12, 24, 213]
 			}]
 		},
+		{
+			"id": "comparator",
+			"name": "Simple comparison",
+			"description": "The input is two numbers, output 1 if the first one is larger, otherwise output 0.",
+			"init_board": "      \n o    \n   2  \n *-L- \n   5  \n      \n",
+			"stages": [{
+				"input": [5, 8],
+				"output": [0]
+			},{
+				"input": [38, 19],
+				"output": [1]
+			},{
+				"input": [0, 0],
+				"output": [0]
+			},{
+				"input": [124, 8],
+				"output": [1]
+			}]
+		},
 		{
 			"id": "copy_odd",
 			"name": "Odd Cat",
-			"description": "copy only the odd numbers from the input",
+			"description": "Copy only the odd numbers from the input",
 			"stages": [{
 				"input": [1, 2, 3, 4, 5, 6, 7],
 				"output": [1, 3, 5, 7]