diff --git a/Shockky/Resources/Config.cs b/Shockky/Resources/Config.cs
index cc21ca6..b683884 100644
--- a/Shockky/Resources/Config.cs
+++ b/Shockky/Resources/Config.cs
@@ -1,4 +1,5 @@
-using System.Drawing;
+using System.Diagnostics;
+using System.Drawing;
 
 using Shockky.IO;
 using Shockky.Resources.Cast;
@@ -126,6 +127,8 @@ public Config(ref ShockwaveReader input, ReaderContext context)
         Field5E = input.ReadInt16BigEndian();
         Field60 = input.ReadInt16BigEndian();
         Field62 = input.ReadInt16BigEndian();
+        
+        Debug.Assert(Checksum == CalculateChecksum(), "Config checksum mismatch!");
     }
 
     public uint CalculateChecksum()
@@ -157,7 +160,7 @@ public uint CalculateChecksum()
             checksum += (uint)(ScoreUsedChannelsMask >> 32) + 23;
             checksum += (uint)(ScoreUsedChannelsMask & 0xFFFFFFFF) + 24;
             checksum *= (uint)Field34 + 25;
-            checksum *= (uint)Tempo + 26;
+            checksum += (uint)Tempo + 26;
             checksum *= (uint)Platform + 27;
             checksum *= (uint)((SaveSeed * 0xE06) + 0xFFF450000); // - 0xBB000
             checksum ^= 0x72616C66;
diff --git a/Shockky/Resources/IResource.cs b/Shockky/Resources/IResource.cs
index 43dec4f..1883c1f 100644
--- a/Shockky/Resources/IResource.cs
+++ b/Shockky/Resources/IResource.cs
@@ -22,8 +22,8 @@ public static IResource Read(scoped ref ShockwaveReader input, ReaderContext con
             OsType.Fcdr => new FileCompressionTypes(ref bodyInput, context),
             OsType.ABMP => new AfterburnerMap(ref bodyInput, context),
 
-            OsType.imap => new IndexMap(ref bodyInput, context),
-            OsType.mmap => new MemoryMap(ref bodyInput, context),
+            OsType.imap => new IndexMap(ref bodyInput),
+            OsType.mmap => new MemoryMap(ref bodyInput),
             OsType.KEYPtr => new KeyMap(ref bodyInput, context),
             OsType.VWCF or OsType.DRCF => new Config(ref bodyInput, context),
 
diff --git a/Shockky/Resources/IndexMap.cs b/Shockky/Resources/IndexMap.cs
index 2e4a1d9..150b3ce 100644
--- a/Shockky/Resources/IndexMap.cs
+++ b/Shockky/Resources/IndexMap.cs
@@ -15,7 +15,7 @@ public sealed class IndexMap : IShockwaveItem, IResource
     public int Field10 { get; set; }
     public int Field14 { get; set; }
 
-    public IndexMap(ref ShockwaveReader input, ReaderContext context)
+    public IndexMap(ref ShockwaveReader input)
     {
         int memoryMapCount = input.ReadInt32BigEndian();
         Debug.Assert(memoryMapCount == 1);
diff --git a/Shockky/Resources/MemoryMap.cs b/Shockky/Resources/MemoryMap.cs
index 5b5fb73..b7b8682 100644
--- a/Shockky/Resources/MemoryMap.cs
+++ b/Shockky/Resources/MemoryMap.cs
@@ -17,7 +17,7 @@ public sealed class MemoryMap : IShockwaveItem, IResource
 
     public ResourceEntry this[int index] => Entries[index];
 
-    public MemoryMap(ref ShockwaveReader input, ReaderContext context)
+    public MemoryMap(ref ShockwaveReader input)
     {
         input.ReadInt16BigEndian();
         input.ReadInt16BigEndian();
@@ -31,7 +31,7 @@ public MemoryMap(ref ShockwaveReader input, ReaderContext context)
 
         for (int i = 0; i < Entries.Length; i++)
         {
-            Entries[i] = new ResourceEntry(ref input, context);
+            Entries[i] = new ResourceEntry(ref input);
         }
     }
 
diff --git a/Shockky/Resources/ResourceEntry.cs b/Shockky/Resources/ResourceEntry.cs
index a427b76..fc04dbc 100644
--- a/Shockky/Resources/ResourceEntry.cs
+++ b/Shockky/Resources/ResourceEntry.cs
@@ -14,7 +14,7 @@ public sealed class ResourceEntry : IShockwaveItem
     public short Unknown { get; set; }
     public int Link { get; set; }
 
-    public ResourceEntry(ref ShockwaveReader input, ReaderContext context)
+    public ResourceEntry(ref ShockwaveReader input)
     {
         Kind = (OsType)input.ReadInt32BigEndian();
         Length = input.ReadInt32BigEndian();