diff --git a/AimeNet/DllMain.cs b/AimeNet/DllMain.cs
index eb0fa18..5dada3f 100644
--- a/AimeNet/DllMain.cs
+++ b/AimeNet/DllMain.cs
@@ -1,9 +1,7 @@
 using System;
 using System.Globalization;
-using System.IO;
 using System.Linq;
 using System.Runtime.InteropServices;
-using System.Text;
 using System.Text.Json;
 using System.Threading;
 using Windows.Win32;
@@ -11,7 +9,6 @@ using Windows.Win32.Foundation;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Http;
-using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 
 namespace AimeNet;
@@ -25,10 +22,11 @@ public static class DllMain
 
     private static string[] _serverAddresses;
     private static string _serverName;
+    private static string _gameId;
 
     private static (byte[] IdBytes, string OriginalId, long Expires)? _currentCard;
 
-    private static readonly object CardLock = new();
+    private static readonly object _cardLock = new();
 
     static DllMain()
     {
@@ -63,25 +61,42 @@ public static class DllMain
             catch (JsonException e)
             {
                 ctx.Response.StatusCode = 400;
+                await ctx.Response.WriteAsync(e.Message);
+
+                return;
+            }
+
+            if (string.IsNullOrEmpty(request?.MatrixCode))
+            {
+                ctx.Response.StatusCode = 400;
+                await ctx.Response.WriteAsync("Card id not provided.");
+                return;
+            }
+
+            if (request.MatrixCode.Length is 0 or < 20)
+            {
+                ctx.Response.StatusCode = 422;
+                await ctx.Response.WriteAsync("Invalid card id length.");
+                return;
+            }
+
+            if (request.MatrixCode.Any(x => !char.IsNumber(x)))
+            {
+                ctx.Response.StatusCode = 422;
+                await ctx.Response.WriteAsync("Invalid card id format.");
                 return;
             }
 
             lock (_cardLock)
             {
-                // don't allow multiple writes in quick succession
+                // ratelimit check
                 if (_currentCard?.Expires > Environment.TickCount64)
                 {
                     ctx.Response.StatusCode = 429;
-                    ctx.Response.Headers.RetryAfter = ((int)TimeSpan.FromTicks(_currentCard.Value.Expires - Environment.TickCount64).TotalSeconds).ToString();
+                    ctx.Response.Headers.RetryAfter = ((int)TimeSpan.FromMilliseconds(_currentCard.Value.Expires - Environment.TickCount64).TotalSeconds).ToString();
                     return;
                 }
 
-                if (request.MatrixCode.Length < 20)
-                {
-                    ctx.Response.StatusCode = 400;
-                    return;
-                }
-                
                 // ensure the matrix code is 20-digits long, otherwise pad with zeros
                 var matrixCode = request.MatrixCode.PadLeft(20, '0');
                 var bytes = new byte[10];
@@ -92,16 +107,17 @@ public static class DllMain
                     bytes[i] = byte.Parse(value, NumberStyles.HexNumber);
                 }
 
-                _currentCard = (bytes, matrixCode, Environment.TickCount64 + 5000000);
+                // it's called a tick count, but it uses milliseconds despite having a unit of time called a tick???
+                _currentCard = (bytes, matrixCode, Environment.TickCount64 + 5000);
             }
 
-            ctx.Response.StatusCode = 204;
+            ctx.Response.StatusCode = 202;
         });
 
         CancellationTokenRegistration cancellationRegistration = default;
         cancellationRegistration = app.Lifetime.ApplicationStarted.Register(() =>
         {
-            _serverLogger.LogInformation("AimeNet started successfully.");
+            _serverLogger.LogInformation("AMNet Server ({gameId}) started successfully.", _gameId);
             _serverLogger.LogInformation("Visit {addr} from a mobile device on the same network to get started.", WebAddress);
 
             cancellationRegistration.Dispose();
@@ -170,15 +186,20 @@ public static class DllMain
     {
         const string configFileName = @".\segatools.ini";
 
+        var gameId = stackalloc char[5];
+        var gameIdStr = new PWSTR(gameId);
+
         var serverName = stackalloc char[64];
         var serverNameStr = new PWSTR(serverName);
 
         var serverAddress = stackalloc char[1024];
         var serverAddressStr = new PWSTR(serverAddress);
 
+        PInvoke.GetPrivateProfileString("aimeio", "gameId", string.Empty, gameIdStr, 5, configFileName);
         PInvoke.GetPrivateProfileString("aimeio", "serverName", Environment.MachineName, serverNameStr, 64, configFileName);
         PInvoke.GetPrivateProfileString("aimeio", "serverAddress", "http://+:6070", serverAddressStr, 1024, configFileName);
 
+        _gameId = gameIdStr.ToString();
         _serverName = serverNameStr.ToString();
         _serverAddresses = serverAddressStr.ToString().Split(';');
     }