diff --git a/30_Cube/csharp/Game.cs b/30_Cube/csharp/Game.cs
index 70ada599..a06ec565 100644
--- a/30_Cube/csharp/Game.cs
+++ b/30_Cube/csharp/Game.cs
@@ -3,6 +3,13 @@ namespace Cube;
 internal class Game
 {
     private const int _initialBalance = 500;
+    private readonly IEnumerable<(int, int, int)> _seeds = new List<(int, int, int)>
+    {
+        (3, 2, 3), (1, 3, 3), (3, 3, 2), (3, 2, 3), (3, 1, 3)
+    };
+    private readonly (float, float, float) _startLocation = (1, 1, 1);
+    private readonly (float, float, float) _goalLocation = (3, 3, 3);
+
     private readonly IReadWrite _io;
     private readonly IRandom _random;
 
@@ -51,6 +58,47 @@ internal class Game
 
     private bool PlayGame()
     {
+        var mineLocations = _seeds.Select(seed => _random.NextLocation(seed)).ToHashSet();
+        var currentLocation = _startLocation;
+        var prompt = Prompts.YourMove;
+
+        while (true)
+        {
+            var newLocation = _io.Read3Numbers(prompt);
+
+            if (!MoveIsLegal(currentLocation, newLocation)) { return Lose(Streams.IllegalMove); }
+
+            currentLocation = newLocation;
+
+            if (currentLocation == _goalLocation) { return Win(Streams.Congratulations); }
+
+            if (mineLocations.Contains(currentLocation)) { return Lose(Streams.Bang); }
+
+            prompt = Prompts.NextMove;
+        }
+    }
+
+    private bool Lose(Stream text)
+    {
+        _io.Write(text);
+        return false;
+    }
+
+    private bool Win(Stream text)
+    {
+        _io.Write(text);
         return true;
     }
+
+    private bool MoveIsLegal((float, float, float) from, (float, float, float) to)
+        => (to.Item1 - from.Item1, to.Item2 - from.Item2, to.Item3 - from.Item3) switch
+        {
+            ( > 1, _, _) => false,
+            (_, > 1, _) => false,
+            (_, _, > 1) => false,
+            (1, 1, _) => false,
+            (1, _, 1) => false,
+            (_, 1, 1) => false,
+            _ => true
+        };
 }
diff --git a/30_Cube/csharp/IOExtensions.cs b/30_Cube/csharp/IOExtensions.cs
index a221ca5d..14f2a85e 100644
--- a/30_Cube/csharp/IOExtensions.cs
+++ b/30_Cube/csharp/IOExtensions.cs
@@ -17,4 +17,4 @@ internal static class IOExtensions
             prompt = Prompts.BetAgain;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/30_Cube/csharp/RandomExtensions.cs b/30_Cube/csharp/RandomExtensions.cs
new file mode 100644
index 00000000..ac05108e
--- /dev/null
+++ b/30_Cube/csharp/RandomExtensions.cs
@@ -0,0 +1,14 @@
+namespace Cube;
+
+internal static class RandomExtensions
+{
+    internal static (float, float, float) NextLocation(this IRandom random, (int, int, int) bias)
+        => (random.NextCoordinate(bias.Item1), random.NextCoordinate(bias.Item2), random.NextCoordinate(bias.Item3));
+
+    private static float NextCoordinate(this IRandom random, int bias)
+    {
+        var value = random.Next(3);
+        if (value == 0) { value = bias; }
+        return value;
+    }
+}
\ No newline at end of file
diff --git a/30_Cube/csharp/Resources/NextMove.txt b/30_Cube/csharp/Resources/NextMove.txt
index 2c3c0611..4cbe5496 100644
--- a/30_Cube/csharp/Resources/NextMove.txt
+++ b/30_Cube/csharp/Resources/NextMove.txt
@@ -1 +1 @@
-Next move:
\ No newline at end of file
+Next move: 
\ No newline at end of file