diff --git a/Sources/Model/Games/GameRunner.cs b/Sources/Model/Games/GameRunner.cs
index a3aefdc..8d771f1 100644
--- a/Sources/Model/Games/GameRunner.cs
+++ b/Sources/Model/Games/GameRunner.cs
@@ -1,64 +1,147 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using Model.Dice;
-using Model.Dice.Faces;
-using Model.Players;
-
-namespace Model.Games
-{
-    public class GameRunner
-    {
-        private readonly IManager<Player> globalPlayerManager;
-        private readonly IManager<KeyValuePair<string, IEnumerable<AbstractDie<AbstractDieFace>>>> globalDieManager;
-        private readonly List<Game> games;
-
-        public GameRunner(IManager<Player> globalPlayerManager, IManager<KeyValuePair<string, IEnumerable<AbstractDie<AbstractDieFace>>>> globalDieManager, List<Game> games)
-        {
-            this.globalPlayerManager = globalPlayerManager;
-            this.globalDieManager = globalDieManager;
-            this.games = games ?? new();
-        }
-
-        public IEnumerable<Game> GetAllGames() => games.AsEnumerable();
-
-        /// <summary>
-        /// finds the game with that name and returns it
-        /// <br/>
-        /// that copy does not belong to this gamerunner's games, so it should not be modified 
-        /// </summary>
-        /// <param name="name">a games's name</param>
-        /// <returns>game with said name, <em>or null</em> if no such game was found</returns>
-        public Game GetOneGameByName(string name)
-        {
-            if (!string.IsNullOrWhiteSpace(name))
-            {
-                Game result = games.FirstOrDefault(g => g.Name == name);
-                return result; // may return null
-            }
-            throw new ArgumentException("param should not be null or blank", nameof(name));
-        }
-
-        public void SaveGame(Game game)
-        {
-            throw new NotSupportedException();
-        }
-
-        public Game LoadGame(string name)
-        {
-            throw new NotSupportedException();
-        }
-
-        public void StartNewGame()
-        {
-            throw new NotSupportedException();
-        }
-
-        public void DeleteGame(Game game)
-        {
-            throw new NotSupportedException();
-        }
-    }
-}
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Model.Dice;
+using Model.Dice.Faces;
+using Model.Players;
+
+namespace Model.Games
+{
+    public class GameRunner
+    {
+        private readonly IManager<Player> globalPlayerManager;
+        private readonly IManager<KeyValuePair<string, IEnumerable<AbstractDie<AbstractDieFace>>>> globalDieManager;
+        private readonly List<Game> games;
+
+        public GameRunner(IManager<Player> globalPlayerManager, IManager<KeyValuePair<string, IEnumerable<AbstractDie<AbstractDieFace>>>> globalDieManager, List<Game> games)
+        {
+            this.globalPlayerManager = globalPlayerManager;
+            this.globalDieManager = globalDieManager;
+            this.games = games ?? new();
+        }
+
+        public IEnumerable<Game> GetAllGames() => games.AsEnumerable();
+
+        /// <summary>
+        /// finds the game with that name and returns it
+        /// <br/>
+        /// that copy does not belong to this gamerunner's games, so it should not be modified 
+        /// </summary>
+        /// <param name="name">a games's name</param>
+        /// <returns>game with said name, <em>or null</em> if no such game was found</returns>
+        public Game GetOneGameByName(string name)
+        {
+            if (!string.IsNullOrWhiteSpace(name))
+            {
+                Game result = games.FirstOrDefault(g => g.Name == name);
+                return result; // may return null
+            }
+            throw new ArgumentException("param should not be null or blank", nameof(name));
+        }
+
+        /// <summary>
+        /// saves a given game -- does not allow copies yet: if a game with the same name exists, it is overwritten
+        /// </summary>
+        /// <param name="game">a game to save</param>
+        /// <exception cref="NotSupportedException"></exception>
+        public void SaveGame(Game game)
+        {
+            if (game != null)
+            {
+                games.Remove(games.FirstOrDefault(g => g.Name == game.Name));
+                // will often be an update: if game with that name exists, it is removed, else, nothing happens above
+                games.Add(game);
+            }
+
+        }
+
+        /// <summary>
+        /// creates a new game
+        /// </summary>
+        /// <exception cref="NotSupportedException"></exception>
+        public void StartNewGame(string name, PlayerManager playerManager, IEnumerable<AbstractDie<AbstractDieFace>> dice)
+        {
+            Game game = new(name, playerManager, dice);
+            SaveGame(game);
+        }
+
+        public void DeleteGame(Game game)
+        {
+            games.Remove(game);
+        }
+
+        /// <summary>
+        /// plays one turn of the game
+        /// </summary>
+        /// <param name="game">the game from which a turn will be played</param>
+        public static void PlayGame(Game game)
+        {
+            Player current = game.GetWhoPlaysNow();
+            game.PerformTurn(current);
+            game.PrepareNextPlayer(current);
+        }
+
+        public void AddGlobalPlayer(Player player)
+        {
+            globalPlayerManager.Add(player);
+        }
+
+        public IEnumerable<Player> GetGlobalPlayers()
+        {
+            return globalPlayerManager.GetAll();
+        }
+
+        public Player GetOneGlobalPlayerByName(string name)
+        {
+            return globalPlayerManager.GetOneByName(name);
+        }
+
+        public void UpdateGlobalPlayer(Player oldPlayer, Player newPlayer)
+        {
+            globalPlayerManager.Update(oldPlayer, newPlayer);
+        }
+
+        public void DeleteGlobalPlayer(Player oldPlayer)
+        {
+            globalPlayerManager.Remove(oldPlayer);
+        }
+
+        public void AddGlobalDiceGroup(string name, IEnumerable<AbstractDie<AbstractDieFace>> dice)
+        {
+            globalDieManager.Add(new KeyValuePair<string, IEnumerable<AbstractDie<AbstractDieFace>>>(name, dice));
+        }
+
+        public IEnumerable<KeyValuePair<string, IEnumerable<AbstractDie<AbstractDieFace>>>> GetGlobalDiceGroups()
+        {
+            return globalDieManager.GetAll();
+        }
+
+        public KeyValuePair<string, IEnumerable<AbstractDie<AbstractDieFace>>> GetOneGlobalDiceGroupByName(string name)
+        {
+            return globalDieManager.GetOneByName(name);
+        }
+
+        /// <summary>
+        /// only updates names
+        /// </summary>
+        /// <param name="oldName">old name</param>
+        /// <param name="newName">new name</param>
+        public void UpdateGlobalDiceGroup(string oldName, string newName)
+        {
+            KeyValuePair<string, IEnumerable<AbstractDie<AbstractDieFace>>> oldDiceGroup = GetOneGlobalDiceGroupByName(oldName);
+            KeyValuePair<string, IEnumerable<AbstractDie<AbstractDieFace>>> newDiceGroup = new(newName, oldDiceGroup.Value);
+            globalDieManager.Update(oldDiceGroup, newDiceGroup);
+        }
+
+        /// <summary>
+        /// will remove those dice groups from other games, potentially breaking them
+        /// </summary>
+        /// <param name="oldDiceGroup"></param>
+        public void DeleteGlobalDiceGroup(string oldName)
+        {
+            globalDieManager.Remove(GetOneGlobalDiceGroupByName(oldName));
+        }
+    }
+}