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diff --git a/projects/10/Square/Main.jack b/projects/10/Square/Main.jack
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+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/10/Square/Main.jack
+
+// (derived from projects/09/Square/Main.jack, with testing additions)
+
+/** Initializes a new Square Dance game and starts running it. */
+class Main {
+    static boolean test;    // Added for testing -- there is no static keyword
+                            // in the Square files.
+    function void main() {
+      var SquareGame game;
+      let game = SquareGame.new();
+      do game.run();
+      do game.dispose();
+      return;
+    }
+
+    function void more() {  // Added to test Jack syntax that is not used in
+        var int i, j;       // the Square files.
+        var String s;
+        var Array a;
+        if (false) {
+            let s = "string constant";
+            let s = null;
+            let a[1] = a[2];
+        }
+        else {              // There is no else keyword in the Square files.
+            let i = i * (-j);
+            let j = j / (-2);   // note: unary negate constant 2
+            let i = i | j;
+        }
+        return;
+    }
+}