diff --git a/.vscode/launch.json b/.vscode/launch.json
index f7bfb872..f1adccf0 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -35,11 +35,11 @@
         },
         {
             "type": "java",
-            "name": "Launch Main (Macro Simulate)",
+            "name": "Launch Simulation Only",
             "request": "launch",
             "mainClass": "electrosphere.engine.Main",
             "projectName": "Renderer",
-            "args" : "--macro-simulate"
+            "args" : "--simulate"
         }
     ]
 }
\ No newline at end of file
diff --git a/src/main/java/electrosphere/engine/Globals.java b/src/main/java/electrosphere/engine/Globals.java
index 64b6bbb9..bccd1675 100644
--- a/src/main/java/electrosphere/engine/Globals.java
+++ b/src/main/java/electrosphere/engine/Globals.java
@@ -61,7 +61,6 @@ import electrosphere.renderer.ui.font.RawFontMap;
 import electrosphere.script.ScriptEngine;
 import electrosphere.server.ai.AIManager;
 import electrosphere.server.datacell.EntityDataCellMapper;
-import electrosphere.server.datacell.GriddedDataCellManager;
 import electrosphere.server.datacell.RealmManager;
 import electrosphere.server.db.DatabaseController;
 import electrosphere.server.pathfinding.NavMeshManager;
@@ -245,6 +244,9 @@ public class Globals {
     //macro simulation
     public static MacroSimulation macroSimulation;
     public static MacroData macroData;
+
+    //flag to only run a simulation without full client
+    public static boolean RUN_SIMULATION_ONLY = false;
     
     //micro simulation
     public static MicroSimulation microSimulation;
diff --git a/src/main/java/electrosphere/engine/Main.java b/src/main/java/electrosphere/engine/Main.java
index 4858be27..d5cf2c20 100644
--- a/src/main/java/electrosphere/engine/Main.java
+++ b/src/main/java/electrosphere/engine/Main.java
@@ -14,13 +14,10 @@ import electrosphere.controls.ControlHandler;
 import electrosphere.engine.cli.CLIParser;
 import electrosphere.engine.loadingthreads.LoadingThread;
 import electrosphere.game.config.UserSettings;
+import electrosphere.game.server.world.MacroData;
 import electrosphere.logger.LoggerInterface;
-import electrosphere.net.parser.net.message.TerrainMessage;
-import electrosphere.net.parser.net.raw.NetworkParser;
-import electrosphere.net.parser.util.ByteStreamUtils;
-import electrosphere.renderer.Model;
 import electrosphere.renderer.RenderingEngine;
-import electrosphere.util.worldviewer.TerrainViewer;
+import electrosphere.server.simulation.MacroSimulation;
 
 
 
@@ -97,22 +94,21 @@ public class Main {
         
         //world gen testing
         //gen terrain
-//        Globals.serverTerrainManager = new ServerTerrainManager(2000,50,100,0.0f,0);
-//        Globals.serverTerrainManager.load();
-//        Globals.serverWorldData = ServerWorldData.createGameWorld(Globals.serverTerrainManager);
-//        //gen world
-//        Globals.macroData = MacroData.generateWorld(0);
-//        Globals.macroData.describeWorld();
-//        boolean run = true;
-//        Globals.macroSimulation = new MacroSimulation();
-//        while(run){
-//            Globals.macroSimulation.simulate();
-//            try {
-//                TimeUnit.MILLISECONDS.sleep(1000);
-//            } catch (InterruptedException ex) {
-//                ex.printStackTrace();
-//            }
-//        }
+        if(Globals.RUN_SIMULATION_ONLY){
+            //gen world
+            Globals.macroData = MacroData.generateWorld(0);
+            Globals.macroData.describeWorld();
+            boolean run = true;
+            Globals.macroSimulation = new MacroSimulation();
+            while(run){
+                Globals.macroSimulation.simulate();
+                try {
+                    TimeUnit.MILLISECONDS.sleep(1000);
+                } catch (InterruptedException ex) {
+                    ex.printStackTrace();
+                }
+            }
+        }
 
 //        if(1==1){
 //            Globals.audioEngine = new AudioEngine();
diff --git a/src/main/java/electrosphere/engine/cli/CLIParser.java b/src/main/java/electrosphere/engine/cli/CLIParser.java
index ce34b8c3..ef35ef11 100644
--- a/src/main/java/electrosphere/engine/cli/CLIParser.java
+++ b/src/main/java/electrosphere/engine/cli/CLIParser.java
@@ -17,8 +17,8 @@ public class CLIParser {
                     Globals.RUN_SERVER = true;
                     Globals.HEADLESS = true;
                 } break;
-                case "--macro-simulate": {
-                    //TODO: macro simulate
+                case "--simulate": {
+                    Globals.RUN_SIMULATION_ONLY = true;
                 } break;
             }
         }