diff --git a/src/main/java/StevenDimDoors/mod_pocketDim/dungeon/pack/DungeonPack.java b/src/main/java/StevenDimDoors/mod_pocketDim/dungeon/pack/DungeonPack.java
index af997fa5..44ea2d1f 100644
--- a/src/main/java/StevenDimDoors/mod_pocketDim/dungeon/pack/DungeonPack.java
+++ b/src/main/java/StevenDimDoors/mod_pocketDim/dungeon/pack/DungeonPack.java
@@ -21,6 +21,7 @@ public class DungeonPack
 	//FIXME: Do not release this code as an update without dealing with disowned types!
 	
 	private static final int MAX_HISTORY_LENGTH = 30;
+	private static final int MAX_SUBTREE_LIST_SIZE = 30;
 	
 	private final String name;
 	private final HashMap<String, DungeonType> nameToTypeMapping;
@@ -136,15 +137,30 @@ public class DungeonPack
 		
 		int maxSearchLength = config.allowDuplicatesInChain() ? maxRuleLength : MAX_HISTORY_LENGTH;
 		ArrayList<DungeonData> history = DungeonHelper.getDungeonChainHistory(dimension, this, maxSearchLength);
-		return getNextDungeon(history, random);
+
+		ArrayList<DungeonData> subtreeHistory;
+		/*if (config.getDuplicateSearchLevels() > 0)
+		{
+			subtreeHistory = DungeonHelper.getFlatDungeonTree(
+					DungeonHelper.getAncestor(dimension, config.getDuplicateSearchLevels()),
+					MAX_SUBTREE_LIST_SIZE);
+		}
+		else
+		{
+			subtreeHistory = new ArrayList<DungeonData>();
+		}*/
+		subtreeHistory = new ArrayList<DungeonData>();
+		
+		return getNextDungeon(history, subtreeHistory, random);
 	}
 	
-	private DungeonData getNextDungeon(ArrayList<DungeonData> history, Random random)
+	private DungeonData getNextDungeon(ArrayList<DungeonData> history, ArrayList<DungeonData> subtreeHistory, Random random)
 	{
 		//Extract the dungeon types that have been used from history and convert them into an array of IDs
 		int index;
 		int[] typeHistory = new int[history.size()];
 		HashSet<DungeonData> excludedDungeons = null;
+		boolean doExclude = !config.allowDuplicatesInChain() || !subtreeHistory.isEmpty();
 		for (index = 0; index < typeHistory.length; index++)
 		{
 			typeHistory[index] = history.get(index).dungeonType().ID;
@@ -163,9 +179,19 @@ public class DungeonPack
 					if (nextType != null)
 					{
 						//Initialize the set of excluded dungeons if needed
-						if (excludedDungeons == null && !config.allowDuplicatesInChain())
+						if (excludedDungeons == null && doExclude)
 						{
-							excludedDungeons = new HashSet<DungeonData>(history);
+							if (config.allowDuplicatesInChain())
+							{
+								excludedDungeons = new HashSet<DungeonData>(subtreeHistory);
+								excludedDungeons.addAll(subtreeHistory);
+							}
+							else
+							{
+								excludedDungeons = new HashSet<DungeonData>(2 * (history.size() + subtreeHistory.size()));
+								excludedDungeons.addAll(history);
+								excludedDungeons.addAll(subtreeHistory);
+							}
 						}
 						
 						//List which dungeons are allowed
diff --git a/src/main/java/StevenDimDoors/mod_pocketDim/dungeon/pack/DungeonPackConfig.java b/src/main/java/StevenDimDoors/mod_pocketDim/dungeon/pack/DungeonPackConfig.java
index 00745450..e5eaa54b 100644
--- a/src/main/java/StevenDimDoors/mod_pocketDim/dungeon/pack/DungeonPackConfig.java
+++ b/src/main/java/StevenDimDoors/mod_pocketDim/dungeon/pack/DungeonPackConfig.java
@@ -11,6 +11,7 @@ public class DungeonPackConfig
 	private boolean allowPackChangeOut;
 	private boolean distortDoorCoordinates;
 	private int packWeight;
+	private int duplicateSearchLevels;
 	private ArrayList<DungeonChainRuleDefinition> rules;
 	
 	public DungeonPackConfig() { }
@@ -25,6 +26,7 @@ public class DungeonPackConfig
 		this.allowPackChangeOut = source.allowPackChangeOut;
 		this.distortDoorCoordinates = source.distortDoorCoordinates;
 		this.packWeight = source.packWeight;
+		this.duplicateSearchLevels = source.duplicateSearchLevels;
 		this.rules = (source.rules != null) ? (ArrayList<DungeonChainRuleDefinition>) source.rules.clone() : null;
 	}
 	
@@ -114,6 +116,16 @@ public class DungeonPackConfig
 		this.packWeight = packWeight;
 	}
 	
+	public int getDuplicateSearchLevels()
+	{
+		return duplicateSearchLevels;
+	}
+	
+	public void setDuplicateSearchLevels(int duplicateSearchLevels)
+	{
+		this.duplicateSearchLevels = duplicateSearchLevels;
+	}
+	
 	public boolean doDistortDoorCoordinates()
 	{
 		return distortDoorCoordinates;
diff --git a/src/main/java/StevenDimDoors/mod_pocketDim/dungeon/pack/DungeonPackConfigReader.java b/src/main/java/StevenDimDoors/mod_pocketDim/dungeon/pack/DungeonPackConfigReader.java
index e24ecc69..0f8b05c0 100644
--- a/src/main/java/StevenDimDoors/mod_pocketDim/dungeon/pack/DungeonPackConfigReader.java
+++ b/src/main/java/StevenDimDoors/mod_pocketDim/dungeon/pack/DungeonPackConfigReader.java
@@ -35,6 +35,8 @@ public class DungeonPackConfigReader extends BaseConfigurationProcessor<DungeonP
 	private final int DEFAULT_PRODUCT_WEIGHT = 100;
 	private final int MAX_DUNGEON_PACK_WEIGHT = 10000;
 	private final int MIN_DUNGEON_PACK_WEIGHT = 1;
+	private final int MAX_DUPLICATE_SEARCH_LEVELS = 5;
+	private final int MIN_DUPLICATE_SEARCH_LEVELS = 0;
 	private final int DEFAULT_DUNGEON_PACK_WEIGHT = 100;
 	private final int MAX_CONDITION_LENGTH = 20;
 	private final int MAX_PRODUCT_COUNT = MAX_CONDITION_LENGTH;
@@ -80,6 +82,7 @@ public class DungeonPackConfigReader extends BaseConfigurationProcessor<DungeonP
 			config.setAllowPackChangeOut(true);
 			config.setDistortDoorCoordinates(false);
 			config.setPackWeight(DEFAULT_DUNGEON_PACK_WEIGHT);
+			config.setDuplicateSearchLevels(MIN_DUPLICATE_SEARCH_LEVELS);
 			
 			//Read the settings section
 			if (findSection("Settings", reader))
@@ -273,6 +276,18 @@ public class DungeonPackConfigReader extends BaseConfigurationProcessor<DungeonP
 							valid = false;
 						}
 					}
+					else if (name.equalsIgnoreCase("DuplicateSearchLevels"))
+					{
+						int levels = Integer.parseInt(value);
+						if (levels >= MIN_DUPLICATE_SEARCH_LEVELS && levels <= MAX_DUPLICATE_SEARCH_LEVELS)
+						{
+							config.setDuplicateSearchLevels(levels);
+						}
+						else
+						{
+							valid = false;
+						}
+					}
 					else
 					{
 						valid = false;
diff --git a/src/main/java/StevenDimDoors/mod_pocketDim/helpers/DungeonHelper.java b/src/main/java/StevenDimDoors/mod_pocketDim/helpers/DungeonHelper.java
index 545168d7..419ffcd9 100644
--- a/src/main/java/StevenDimDoors/mod_pocketDim/helpers/DungeonHelper.java
+++ b/src/main/java/StevenDimDoors/mod_pocketDim/helpers/DungeonHelper.java
@@ -615,7 +615,7 @@ public class DungeonHelper
 		{
 			throw new IllegalArgumentException("dimension cannot be null.");
 		}
-		if(dimension.parent()==null)
+		if (dimension.parent() == null)
 		{
 			return new ArrayList<DungeonData>();
 		}
@@ -664,4 +664,11 @@ public class DungeonHelper
 		}
 		return dungeons;
 	}
+	
+	public static NewDimData getAncestor(NewDimData dimension, int levels)
+	{
+		// Find the ancestor of a dimension located a specified number of levels up.
+		// If such an ancestor does not exist, return the root dimension.
+		return null;
+	}
 }
\ No newline at end of file
diff --git a/src/main/resources/schematics/ruins/rules.txt b/src/main/resources/schematics/ruins/rules.txt
index a14fe17d..06188586 100644
--- a/src/main/resources/schematics/ruins/rules.txt
+++ b/src/main/resources/schematics/ruins/rules.txt
@@ -16,6 +16,8 @@ DistortDoorCoordinates = true
 ## Prevent this pack from being selected for transitioning in once we've transitioned out
 AllowPackChangeIn = false
 
+DuplicateSearchLevels = 1
+
 Rules:
 
 Exit -> DeadEnd Exit