diff --git a/a-star/heuristics.js b/a-star/heuristics.js
index 749c097..83fee62 100644
--- a/a-star/heuristics.js
+++ b/a-star/heuristics.js
@@ -2,6 +2,17 @@ module.exports = {
   l2: l2,
   l1: l1
 };
+/**
+ * Distance squared;
+ * 
+ * @param {*} a 
+ * @param {*} b 
+ */
+function l3(a, b) {
+  var dx = Math.abs(a.x - b.x);
+  var dy = Math.abs(a.y - b.y);
+  return Math.pow((dx  + dy), 2);
+}
 
 /**
  * Euclid distance (l2 norm);