diff --git a/app/src/main/java/school_project/Map.java b/app/src/main/java/school_project/Map.java
index 28008b0..e67944a 100644
--- a/app/src/main/java/school_project/Map.java
+++ b/app/src/main/java/school_project/Map.java
@@ -1,9 +1,14 @@
 package school_project;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 
+/**
+ * Represent the map with its pieces.
+ * Every piece has a position element that represent its position on the map
+ */
 public class Map extends Shape{
-    private ArrayList<Piece> pieces;
+    private final ArrayList<Piece> pieces = new ArrayList<>();
 
     public Map(boolean[][] matrix) {
         super(matrix);
@@ -13,8 +18,8 @@ public class Map extends Shape{
         super();
     }
 
-    // TODO: 2/27/23 Tests for Map 
     public void addPiece(Piece piece){
+        piece.setLinked_map(this);
         pieces.add(piece);
     }
 
@@ -22,4 +27,29 @@ public class Map extends Shape{
         for (Piece p : pieces)
             this.addPiece(p);
     }
+
+    /**
+     * Return a matrix with all used space on the map to see if a piece can fit in a space
+     *
+     * @return matrix of boolean with false being the not used space
+     */
+    public boolean[][] getUsedSpace(){
+
+        // Copy of the map to avoid side effect
+        boolean[][] used = new boolean[height][width];
+        for (int i = 0; i < height; i++) {
+            used[i] = Arrays.copyOf(matrix[i], width);
+        }
+
+        for (Piece p : pieces) {
+            for(int x = 0; x < p.height; x++){
+                for(int y = 0; y < p.width; y++){
+                    if (p.getShape()[x][y]){
+                        used[p.getPosition().x + x][p.getPosition().y + y] = false;
+                    }
+                }
+            }
+        }
+        return used;
+    }
 }
diff --git a/app/src/main/java/school_project/Piece.java b/app/src/main/java/school_project/Piece.java
index 50d7c4e..a358dd2 100644
--- a/app/src/main/java/school_project/Piece.java
+++ b/app/src/main/java/school_project/Piece.java
@@ -1,8 +1,16 @@
 package school_project;
 
+/**
+ * Represent a Piece in the game.
+ * Every Piece should be contained in a Map Object.
+ * A piece has a position witch is the position of its top-leftest position in its matrix.
+ * If the piece is not placed in the Map (in a floating state) the position should be null;
+ */
 public class Piece extends Shape{
 
-    private int x,y; // Position in the Map Object
+    private Vec2 Position;
+    private Map linked_map;
+
     public Piece() {
         super();
     }
@@ -11,6 +19,26 @@ public class Piece extends Shape{
         super(matrix);
     }
 
+    public Vec2 getPosition() {
+        return Position;
+    }
+
+    public void setPosition(Vec2 position){
+        if (linked_map == null) {
+            return;
+        }
+
+        this.Position = position;
+    }
+
+    /**
+     * set the map the piece is into the the map argument
+     * @param map map where to place the piece
+     */
+    public void setLinked_map(Map map){
+        this.linked_map = map;
+    }
+
     /**
      * Rotate the matrix of the piece. Used when the player right click
      *
diff --git a/app/src/main/java/school_project/Shape.java b/app/src/main/java/school_project/Shape.java
index 64f7bca..7061bc2 100644
--- a/app/src/main/java/school_project/Shape.java
+++ b/app/src/main/java/school_project/Shape.java
@@ -1,6 +1,10 @@
 package school_project;
 
 
+/**
+ * Base class for everything that is a shape kind, like map and pieces
+ * it contain a matrix of boolean where the shape is defined by the true's
+ */
 public class Shape {
     
     protected boolean[][] matrix;
diff --git a/app/src/main/java/school_project/Vec2.java b/app/src/main/java/school_project/Vec2.java
new file mode 100644
index 0000000..79d4fd9
--- /dev/null
+++ b/app/src/main/java/school_project/Vec2.java
@@ -0,0 +1,19 @@
+package school_project;
+
+/**
+ * This is used to represent a position/vector/... any ensemble of 2 elements that have to work together in
+ * a plan. This way we can use some basic operations over them.
+ */
+public class Vec2 {
+    public int x, y;
+
+    public Vec2() {
+        x = -1;
+        y = -1;
+    }
+
+    public Vec2(int x, int y ){
+        this.x = x;
+        this.y = y;
+    }
+}
diff --git a/app/src/test/java/school_project/MapTest.java b/app/src/test/java/school_project/MapTest.java
new file mode 100644
index 0000000..289997b
--- /dev/null
+++ b/app/src/test/java/school_project/MapTest.java
@@ -0,0 +1,35 @@
+package school_project;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class MapTest {
+
+    @Test
+    void getUsedSpace() {
+        boolean[][] map_matrix = {
+                {false, true, true, false},
+                {false, true, true, true},
+                {true, true, true, false},
+                {false, true, true, true}
+        };
+        Map testMap = new Map(map_matrix);
+
+        boolean[][] piece1_matrix = {
+                {true, true},
+                {true, true},
+        };
+        Piece piece1 = new Piece(piece1_matrix);
+        testMap.addPiece(piece1);
+        piece1.setPosition(new Vec2(0,1));
+
+        boolean[][] result_matrix = {
+                {false, false, false, false},
+                {false, false, false, true},
+                {true, true, true, false},
+                {false, true, true, true}
+        };
+        assertArrayEquals(result_matrix, testMap.getUsedSpace());
+    }
+}
\ No newline at end of file