diff --git a/SubnauticaRandomiser/Initialiser.cs b/SubnauticaRandomiser/Initialiser.cs
index f05d60d..935ef7c 100644
--- a/SubnauticaRandomiser/Initialiser.cs
+++ b/SubnauticaRandomiser/Initialiser.cs
@@ -20,7 +20,7 @@ internal class Initialiser : BaseUnityPlugin
     {
         public const string GUID = "com.github.tinyhoot.SubnauticaRandomiser";
         public const string NAME = "Subnautica Randomiser";
-        public const string VERSION = "0.10.0";
+        public const string VERSION = "0.10.1";
         
         // Files and structure.
         internal static string _ModDirectory;
diff --git a/SubnauticaRandomiser/Logic/AuroraLogic.cs b/SubnauticaRandomiser/Logic/AuroraLogic.cs
index e55b1e0..8f1e9bb 100644
--- a/SubnauticaRandomiser/Logic/AuroraLogic.cs
+++ b/SubnauticaRandomiser/Logic/AuroraLogic.cs
@@ -74,7 +74,7 @@ public void RandomiseDoorCodes()
                 // Keypads only have numbers 1-9, zeroes cannot be entered at all.
                 while (code.Contains("0"))
                 {
-                    code = _random.Next(1111, 9999).ToString().PadLeft(4, '3');
+                    code = _random.Next(1111, 9999).ToString();
                 }
                 _log.Debug($"[AR] Assigning accessCode {code} to {classId}");
                 keyCodes.Add(classId, code);
diff --git a/SubnauticaRandomiser/Logic/CoreLogic.cs b/SubnauticaRandomiser/Logic/CoreLogic.cs
index 1ddbecd..457ffc0 100644
--- a/SubnauticaRandomiser/Logic/CoreLogic.cs
+++ b/SubnauticaRandomiser/Logic/CoreLogic.cs
@@ -5,7 +5,6 @@
 using System.Linq;
 using System.Threading.Tasks;
 using HarmonyLib;
-using JetBrains.Annotations;
 using SubnauticaRandomiser.Handlers;
 using SubnauticaRandomiser.Interfaces;
 using SubnauticaRandomiser.Logic.Recipes;
@@ -32,6 +31,7 @@ internal class CoreLogic : MonoBehaviour
         public EntityHandler EntityHandler { get; private set; }
         public IRandomHandler Random { get; private set; }
 
+        private Harmony _harmony;
         private ProgressionManager _manager;
         private SpoilerLog _spoilerLog;
 
@@ -94,6 +94,11 @@ private void Awake()
             _spoilerLog = gameObject.EnsureComponent<SpoilerLog>();
         }
 
+        private void OnDestroy()
+        {
+            _harmony?.UnpatchSelf();
+        }
+
         private void EnableModules()
         {
             if (!_Config.sSpawnPoint.Equals("Vanilla"))
@@ -194,12 +199,14 @@ private IEnumerator RandomiseMainEntities(List<LogicEntity> notRandomised)
                     yield return null;
                 if (circuitbreaker > 3000)
                 {
-                    _Log.InGameMessage("[Core] Failed to randomise items: stuck in infinite loop!");
+                    _Log.InGameMessage("[Core] Failed to randomise entities: stuck in infinite loop!");
                     _Log.Fatal("[Core] Encountered infinite loop, aborting!");
                     throw new TimeoutException("Encountered infinite loop while randomising!");
                 }
 
                 LogicEntity nextEntity = ChooseNextEntity(notRandomised);
+                if (nextEntity is null)
+                    continue;
                 // Try to get a handler for this type of entity.
                 ILogicModule handler = _handlingModules.GetOrDefault(nextEntity.EntityType, null);
                 if (handler is null)
@@ -242,7 +249,11 @@ public void AddPrerequisitesAsPriority(LogicEntity entity)
             {
                 LogicEntity prereq = EntityHandler.GetEntity(techType);
                 if (!HasRandomised(prereq))
+                {
                     _priorityEntities.Insert(0, prereq);
+                    // Ensure that the prerequisites' requirements are also fulfilled.
+                    AddPrerequisitesAsPriority(prereq);
+                }
             }
         }
 
@@ -281,7 +292,6 @@ internal void ApplyAllChanges()
         /// Get the next entity to be randomised, prioritising essential or elective ones.
         /// </summary>
         /// <returns>The next entity.</returns>
-        [NotNull]
         private LogicEntity ChooseNextEntity(List<LogicEntity> notRandomised)
         {
             // Make sure the list of absolutely essential entities is exhausted first.
@@ -299,6 +309,12 @@ private LogicEntity ChooseNextEntity(List<LogicEntity> notRandomised)
                 _priorityEntities.RemoveAt(0);
             }
             next ??= Random.Choice(notRandomised);
+            while (HasRandomised(next))
+            {
+                _Log.Debug($"[Core] Found duplicate entity in main loop, removing: {next}");
+                notRandomised.Remove(next);
+                next = Random.Choice(notRandomised);
+            }
 
             // Invoke the associated event.
             EntityChosen?.Invoke(this, new EntityEventArgs(next));
@@ -311,13 +327,13 @@ private LogicEntity ChooseNextEntity(List<LogicEntity> notRandomised)
         /// </summary>
         private void EnableHarmony()
         {
-            Harmony harmony = new Harmony(Initialiser.GUID);
+            _harmony = new Harmony(Initialiser.GUID);
             foreach (ILogicModule module in _modules)
             {
-                module.SetupHarmonyPatches(harmony);
+                module.SetupHarmonyPatches(_harmony);
             }
             // Always apply bugfixes.
-            harmony.PatchAll(typeof(VanillaBugfixes));
+            _harmony.PatchAll(typeof(VanillaBugfixes));
         }
 
         /// <summary>
diff --git a/SubnauticaRandomiser/Patches/LanguagePatcher.cs b/SubnauticaRandomiser/Patches/LanguagePatcher.cs
index 4290c57..f81a7e2 100644
--- a/SubnauticaRandomiser/Patches/LanguagePatcher.cs
+++ b/SubnauticaRandomiser/Patches/LanguagePatcher.cs
@@ -11,16 +11,26 @@ internal class LanguagePatcher
         /// Edit the description of the PDA logs on door access codes to reflect the codes they were randomised to.
         /// </summary>
         [HarmonyPostfix]
-        [HarmonyPatch(typeof(Language), nameof(Language.Start))]
+        [HarmonyPatch(typeof(Language), nameof(Language.SetCurrentLanguage))]
         public static void PatchAccessCodeEntries()
         {
             foreach (var kv in CoreLogic._Serializer.DoorKeyCodes)
             {
                 string descId = AuroraLogic.KeypadPrefabClassIds[kv.Key];
                 string originalDesc = Language.main.Get(descId);
-                string newDesc = Regex.Replace(originalDesc, "[0-9]{4}", kv.Value);
+                string newDesc = Regex.Replace(originalDesc, "[0-9]{4}", kv.Value, RegexOptions.CultureInvariant);
                 Language.main.strings[descId] = newDesc;
             }
         }
+        
+        /// <summary>
+        /// For people with stupidly fast computers. STOP LOADING EVERYTHING SO FAST
+        /// </summary>
+        [HarmonyPostfix]
+        [HarmonyPatch(typeof(Player), nameof(Player.Start))]
+        public static void PatchAccessCodeEntriesWithAHammer()
+        {
+            PatchAccessCodeEntries();
+        }
     }
 }
\ No newline at end of file