diff --git a/screeps.com/tutorial-1/main.js b/screeps.com/tutorial-1/main.js
index 281f8ba..ef47d4d 100644
--- a/screeps.com/tutorial-1/main.js
+++ b/screeps.com/tutorial-1/main.js
@@ -1,3 +1,9 @@
+var roleHarvester = require('role.harvester');
+
 module.exports.loop = function () {
-	
-}
+
+    for(var name in Game.creeps) {
+        var creep = Game.creeps[name];
+        roleHarvester.run(creep);
+    }
+}
\ No newline at end of file
diff --git a/screeps.com/tutorial-1/role.harvester.js b/screeps.com/tutorial-1/role.harvester.js
new file mode 100644
index 0000000..4d3827d
--- /dev/null
+++ b/screeps.com/tutorial-1/role.harvester.js
@@ -0,0 +1,28 @@
+/*
+ * Module code goes here. Use 'module.exports' to export things:
+ * module.exports.thing = 'a thing';
+ *
+ * You can import it from another modules like this:
+ * var mod = require('role.harvester');
+ * mod.thing == 'a thing'; // true
+ */
+
+var roleHarvester = {
+
+    /** @param {Creep} creep **/
+    run: function(creep) {
+	    if(creep.store.getFreeCapacity() > 0) {
+            var sources = creep.room.find(FIND_SOURCES);
+            if(creep.harvest(sources[0]) == ERR_NOT_IN_RANGE) {
+                creep.moveTo(sources[0]);
+            }
+        }
+        else {
+            if(creep.transfer(Game.spawns['Spawn1'], RESOURCE_ENERGY) == ERR_NOT_IN_RANGE) {
+                creep.moveTo(Game.spawns['Spawn1']);
+            }
+        }
+	}
+};
+
+module.exports = roleHarvester;
\ No newline at end of file