diff --git a/src/main/java/org/ultramine/server/world/load/AbstractWorldLoader.java b/src/main/java/org/ultramine/server/world/load/AbstractWorldLoader.java
index 1c89425..44eaf07 100644
--- a/src/main/java/org/ultramine/server/world/load/AbstractWorldLoader.java
+++ b/src/main/java/org/ultramine/server/world/load/AbstractWorldLoader.java
@@ -1,5 +1,7 @@
 package org.ultramine.server.world.load;
 
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 import org.ultramine.server.WorldsConfig.WorldConfig;
 import org.ultramine.server.world.WorldDescriptor;
 
@@ -13,6 +15,7 @@
 
 public abstract class AbstractWorldLoader implements IWorldLoader
 {
+	private static final Logger log = LogManager.getLogger();
 	protected final WorldDescriptor desc;
 	protected final MinecraftServer server;
 	
@@ -43,20 +46,37 @@
 	@SideOnly(Side.SERVER)
 	protected WorldSettings makeSettings(WorldInfo wi, WorldConfig conf)
 	{
-		WorldSettings mainSettings;
+		WorldSettings settings;
 
 		if (wi == null)
 		{
-			mainSettings = new WorldSettings(toSeed(conf.generation.seed), server.getGameType(), conf.generation.generateStructures,
-					server.isHardcore(), WorldType.parseWorldType(conf.generation.levelType));
-			mainSettings.func_82750_a(conf.generation.generatorSettings);
+			WorldType levelType = WorldType.parseWorldType(conf.generation.levelType);
+			if(levelType == null)
+				throw new RuntimeException("Unknown level type \""+conf.generation.levelType+"\"");
+			settings = new WorldSettings(toSeed(conf.generation.seed), server.getGameType(), conf.generation.generateStructures,
+					server.isHardcore(), levelType);
+			settings.func_82750_a(conf.generation.generatorSettings);
 		}
 		else
 		{
-			mainSettings = new WorldSettings(wi);
+			settings = new WorldSettings(wi);
+
+			if(wi.getSeed() != toSeed(conf.generation.seed))
+				logUnequalOption("Random seed", wi.getSeed());
+			if(wi.getGameType() != server.getGameType())
+				logUnequalOption("Game type", wi.getGameType());
+			if(wi.isMapFeaturesEnabled() != conf.generation.generateStructures)
+				logUnequalOption("'generateStructures' flag", wi.isMapFeaturesEnabled());
+			if(wi.isHardcoreModeEnabled() != server.isHardcore())
+				logUnequalOption("'hardcore' flag", wi.isHardcoreModeEnabled());
+			if(!wi.getGeneratorOptions().equals(conf.generation.generatorSettings))
+				logUnequalOption("Generator settings", wi.getGeneratorOptions());
+			WorldType levelType = WorldType.parseWorldType(conf.generation.levelType);
+			if(levelType == null || !wi.getTerrainType().getWorldTypeName().equals(levelType.getWorldTypeName()))
+				logUnequalOption("Generator settings", wi.getTerrainType().getWorldTypeName());
 		}
 		
-		return mainSettings;
+		return settings;
 	}
 	
 	protected static long toSeed(String seedstr)
@@ -70,4 +90,10 @@
 			return seedstr.hashCode();
 		}
 	}
+
+	private void logUnequalOption(String optionName, Object value)
+	{
+		log.warn("{} of world [{}]({}) in level.dat and worlds.yml is not equal. Using value from level.dat: {}",
+				optionName, desc.getDimension(), desc.getName(), value);
+	}
 }