Maps are more generic as well as cells.

ConsoleApp/Maps/HexMap.cs

@@ -3,21 +3,23 @@ using System.Collections.Generic;
 
 namespace ConsoleApp.Maps
 {
-    public class HexMap
+    public class HexMap : IHexMap
     {
         private HexCell[,] Map { get; }
 
         public HexMap(int x, int y)
         {
+            Map = new HexCell[x+1,y+1];
             for (int r = 0; r < y; r++) {
                 int r_offset = Convert.ToInt32(Math.Floor(Convert.ToDouble(r)/2));
-                for (int q = -r_offset; q < x - r_offset; q++) {
+                for (int q = r_offset; q < x - r_offset; q++) {
+                    // Console.WriteLine($"r:{r}, q:{q}-----x:{x}, y:{y}");
                     Map[r, q] = new HexCell(q, r, -q-r);
                 }
             }
         }
 
-        public List<ICell> PossibleMoves(HexCell fromCell, Direction direction, Double orientation)
+        public List<ICell> PossibleMoves(ICell currentCell)
         {
             throw new NotImplementedException();
         }