diff --git a/src/yugecin/opsudance/OpsuDance.java b/src/yugecin/opsudance/OpsuDance.java
index 369ba2e9..c476dad0 100644
--- a/src/yugecin/opsudance/OpsuDance.java
+++ b/src/yugecin/opsudance/OpsuDance.java
@@ -18,26 +18,58 @@
 package yugecin.opsudance;
 
 import com.google.inject.Inject;
+import itdelatrisu.opsu.Options;
+import itdelatrisu.opsu.Utils;
+import itdelatrisu.opsu.db.DBController;
+import itdelatrisu.opsu.downloads.DownloadList;
+import itdelatrisu.opsu.downloads.Updater;
 import org.lwjgl.LWJGLException;
+import org.newdawn.slick.util.Log;
 import yugecin.opsudance.core.DisplayContainer;
 import yugecin.opsudance.errorhandling.ErrorHandler;
 import yugecin.opsudance.states.EmptyState;
 
+import java.io.File;
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.ServerSocket;
+import java.net.UnknownHostException;
+
 import static yugecin.opsudance.kernel.Entrypoint.sout;
 
+/*
+ * loosely based on itdelatrisu.opsu.Opsu
+ */
 public class OpsuDance {
 
 	private final DisplayContainer container;
 
+	private ServerSocket singleInstanceSocket;
+
 	@Inject
 	public OpsuDance(DisplayContainer container) {
 		this.container = container;
 	}
 
-	public void start() {
+	public void start(String[] args) {
 		sout("initialized");
+
+		checkRunningDirectory();
+		Options.parseOptions();
+		ensureSingleInstance();
+		sout("prechecks done and options parsed");
+
+		initDatabase();
+		initUpdater(args);
+		sout("database & updater initialized");
+
 		container.switchStateNow(EmptyState.class);
+
 		while (rungame());
+
+		closeSingleInstanceSocket();
+		DBController.closeConnections();
+		DownloadList.get().cancelAllDownloads();
 	}
 
 	private boolean rungame() {
@@ -57,4 +89,84 @@ public class OpsuDance {
 		return caughtException != null && ErrorHandler.error("update/render error", caughtException, container).show().shouldIgnoreAndContinue();
 	}
 
+	private void initDatabase() {
+		try {
+			DBController.init();
+		} catch (UnsatisfiedLinkError e) {
+			errorAndExit("Could not initialize database.", e);
+		}
+	}
+
+	private void initUpdater(String[] args) {
+		// check if just updated
+		if (args.length >= 2)
+			Updater.get().setUpdateInfo(args[0], args[1]);
+
+		// check for updates
+		if (Options.isUpdaterDisabled()) {
+			return;
+		}
+		new Thread() {
+			@Override
+			public void run() {
+				try {
+					Updater.get().checkForUpdates();
+				} catch (IOException e) {
+					Log.warn("updatecheck failed.", e);
+				}
+			}
+		}.start();
+	}
+
+	private void checkRunningDirectory() {
+		if (!Utils.isJarRunning()) {
+			return;
+		}
+		File runningDir = Utils.getRunningDirectory();
+		if (runningDir == null) {
+			return;
+		}
+		if (runningDir.getAbsolutePath().indexOf('!') == -1) {
+			return;
+		}
+		errorAndExit("Cannot run from a path that contains a '!'. Please move or rename the jar and try again.");
+	}
+
+	private void ensureSingleInstance() {
+		if (Options.noSingleInstance()) {
+			return;
+		}
+		try {
+			singleInstanceSocket = new ServerSocket(Options.getPort(), 1, InetAddress.getLocalHost());
+		} catch (UnknownHostException e) {
+			// shouldn't happen
+		} catch (IOException e) {
+			errorAndExit(String.format(
+					"Could not launch. Either opsu! is already running or a different program uses port %d.\n" +
+					"You can change the port opsu! uses by editing the 'Port' field in the .opsu.cfg configuration file.\n" +
+					"If that still does not resolve the problem, you can set 'NoSingleInstance' to 'true', but this is not recommended.", Options.getPort()), e);
+		}
+	}
+
+	private void closeSingleInstanceSocket() {
+		if (singleInstanceSocket == null) {
+			return;
+		}
+		try {
+			singleInstanceSocket.close();
+		} catch (IOException e) {
+			Log.error("Single instance socket was not closed!", e);
+		}
+	}
+
+	private void errorAndExit(String errstr) {
+		ErrorHandler.error(errstr, new Throwable()).preventContinue().show();
+		System.exit(1);
+	}
+
+	private void errorAndExit(String errstr, Throwable cause) {
+		ErrorHandler.error(errstr, cause).preventContinue().show();
+		System.exit(1);
+	}
+
 }
diff --git a/src/yugecin/opsudance/kernel/Entrypoint.java b/src/yugecin/opsudance/kernel/Entrypoint.java
index d330666a..13914a6f 100644
--- a/src/yugecin/opsudance/kernel/Entrypoint.java
+++ b/src/yugecin/opsudance/kernel/Entrypoint.java
@@ -25,7 +25,7 @@ public class Entrypoint {
 
 	public static void main(String[] args) {
 		sout("launched");
-		InstanceContainerImpl.initialize().provide(OpsuDance.class).start();
+		InstanceContainerImpl.initialize().provide(OpsuDance.class).start(args);
 	}
 
 	public static long runtime() {