diff --git a/SabreTools.Helper/Dats/DatFile.cs b/SabreTools.Helper/Dats/DatFile.cs
index cc7f4d40..1b34f95f 100644
--- a/SabreTools.Helper/Dats/DatFile.cs
+++ b/SabreTools.Helper/Dats/DatFile.cs
@@ -31,6 +31,8 @@ namespace SabreTools.Helper.Dats
 		private bool _excludeOf;
 		private bool _mergeRoms;
 		private Hash _stripHash;
+		private bool _oneGameOneRegion;
+		private List<string> _regions = new List<string>();
 		private SortedDictionary<string, List<DatItem>> _files = new SortedDictionary<string, List<DatItem>>();
 		private SortedBy _sortedBy;
 
@@ -168,6 +170,16 @@ namespace SabreTools.Helper.Dats
 			get { return _stripHash; }
 			set { _stripHash = value; }
 		}
+		public bool OneGameOneRegion
+		{
+			get { return _oneGameOneRegion; }
+			set { _oneGameOneRegion = value; }
+		}
+		public List<string> Regions
+		{
+			get { return _regions; }
+			set { _regions = value; }
+		}
 		public SortedBy SortedBy
 		{
 			get { return _sortedBy; }
diff --git a/SabreTools/Partials/SabreTools.Help.cs b/SabreTools/Partials/SabreTools.Help.cs
index 95a4b5ab..f3623595 100644
--- a/SabreTools/Partials/SabreTools.Help.cs
+++ b/SabreTools/Partials/SabreTools.Help.cs
@@ -8,6 +8,7 @@ namespace SabreTools
 {
 	public partial class SabreTools
 	{
+		// TODO: Add 1G1R to the flags for update
 		public static Help RetrieveHelp()
 		{
 			// Create and add the header to the Help object
diff --git a/SabreTools/Partials/SabreTools.Inits.cs b/SabreTools/Partials/SabreTools.Inits.cs
index d6fc5e9a..4c464582 100644
--- a/SabreTools/Partials/SabreTools.Inits.cs
+++ b/SabreTools/Partials/SabreTools.Inits.cs
@@ -459,6 +459,8 @@ namespace SabreTools
 		/// <param name="bare">True if the date should not be appended to the default name, false otherwise [OBSOLETE]</param>
 		/// /* Filtering info */
 		/// <param name="filter">Pre-populated filter object for DAT filtering</param>
+		/// <param name="oneGameOneRegion">True if the outputs should be created in 1G1R mode, false otherwise</param>
+		/// <param name="regions">List of regions in the order they should be used, blank for default</param>
 		/// /* Trimming info */
 		/// <param name="splitType">Type of the split that should be performed (split, merged, fully merged)</param>
 		/// <param name="trim">True if we are supposed to trim names to NTFS length, false otherwise</param>
@@ -514,6 +516,8 @@ namespace SabreTools
 
 			/* Filtering info */
 			Filter filter,
+			bool oneGameOneRegion,
+			List<string> regions,
 
 			/* Trimming info */
 			SplitType splitType,
@@ -595,6 +599,35 @@ namespace SabreTools
 				}
 			}
 
+			// Set the 1G1R regions alphabetically if not already set
+			if (regions == null || regions.Count == 0)
+			{
+				regions = new List<string>()
+				{
+					"australia",
+					"canada",
+					"china",
+					"denmark",
+					"europe",
+					"finland",
+					"france",
+					"germany",
+					"greece",
+					"italy",
+					"japan",
+					"korea",
+					"netherlands",
+					"norway",
+					"russia",
+					"spain",
+					"sweden",
+					"usa",
+					"usa, australia",
+					"usa, europe",
+					"world",
+				};
+			}
+
 			// Normalize the extensions
 			addext = (addext == "" || addext.StartsWith(".") ? addext : "." + addext);
 			repext = (repext == "" || repext.StartsWith(".") ? repext : "." + repext);
@@ -653,6 +686,8 @@ namespace SabreTools
 				ExcludeOf = excludeOf,
 				DatFormat = datFormat,
 				StripHash = stripHash,
+				OneGameOneRegion = oneGameOneRegion,
+				Regions = regions,
 
 				UseGame = usegame,
 				Prefix = prefix,
diff --git a/SabreTools/SabreTools.cs b/SabreTools/SabreTools.cs
index 4ef27667..d9f75061 100644
--- a/SabreTools/SabreTools.cs
+++ b/SabreTools/SabreTools.cs
@@ -102,6 +102,7 @@ namespace SabreTools
 				inplace = false,
 				inverse = false,
 				merge = false,
+				oneGameOneRegion = false,
 				parseArchivesAsFiles = false,
 				quickScan = false,
 				quotes = false,
@@ -159,6 +160,7 @@ namespace SabreTools
 			List<string> exta = new List<string>();
 			List<string> extb = new List<string>();
 			List<string> inputs = new List<string>();
+			List<string> regions = new List<string>();
 
 			// Get the first argument as a feature flag
 			string feature = args[0];
@@ -270,6 +272,10 @@ namespace SabreTools
 				switch (args[i])
 				{
 					// User flags
+					case "-1g1r":
+					case "--1g1r":
+						oneGameOneRegion = true;
+						break;
 					case "-ab":
 					case "--add-blank":
 						addBlankFilesForEmptyFolder = true;
@@ -776,6 +782,10 @@ namespace SabreTools
 					case "--root-dir":
 						root = args[++i];
 						break;
+					case "-reg":
+					case "--region":
+						regions.Add(args[++i]);
+						break;
 					case "-rep":
 					case "--rep-ext":
 						repext = args[++i];
@@ -1044,6 +1054,10 @@ namespace SabreTools
 								case "--root-dir":
 									root = split[1];
 									break;
+								case "-reg":
+								case "--region":
+									regions.Add(split[1]);
+									break;
 								case "-rep":
 								case "--rep-ext":
 									repext = split[1];
@@ -1165,29 +1179,9 @@ namespace SabreTools
 			// Create a DAT from a directory or set of directories
 			if (datFromDir)
 			{
-				InitDatFromDir(inputs,
-					filename,
-					name,
-					description,
-					category,
-					version,
-					author,
-					forcepack,
-					excludeOf,
-					datFormat,
-					romba,
-					superdat,
-					omitFromScan,
-					removeDateFromAutomaticName,
-					parseArchivesAsFiles,
-					enableGzip,
-					addBlankFilesForEmptyFolder,
-					addFileDates,
-					tempDir,
-					outDir,
-					copyFiles,
-					header,
-					maxParallelism);
+				InitDatFromDir(inputs, filename, name, description, category, version, author, forcepack, excludeOf,
+					datFormat, romba, superdat, omitFromScan, removeDateFromAutomaticName, parseArchivesAsFiles, enableGzip,
+					addBlankFilesForEmptyFolder, addFileDates, tempDir, outDir, copyFiles, header, maxParallelism);
 			}
 
 			// If we're in header extract and remove mode
@@ -1250,9 +1244,9 @@ namespace SabreTools
 			else if (update)
 			{
 				InitUpdate(inputs, filename, name, description, rootdir, category, version, date, author, email, homepage, url, comment, header,
-					superdat, forcemerge, forcend, forcepack, excludeOf, datFormat, usegame, prefix,
-					postfix, quotes, repext, addext, remext, datPrefix, romba, merge, diffMode, inplace, skip, removeDateFromAutomaticName,
-					filter, splitType, trim, single, root, outDir, cleanGameNames, descAsName, dedup, stripHash, maxParallelism);
+					superdat, forcemerge, forcend, forcepack, excludeOf, datFormat, usegame, prefix, postfix, quotes, repext, addext, remext,
+					datPrefix, romba, merge, diffMode, inplace, skip, removeDateFromAutomaticName, filter, oneGameOneRegion, regions,
+					splitType, trim, single, root, outDir, cleanGameNames, descAsName, dedup, stripHash, maxParallelism);
 			}
 
 			// If we're using the verifier