diff --git a/src/backend/Agent.java b/src/backend/Agent.java
index 17bdf17..8f44756 100644
--- a/src/backend/Agent.java
+++ b/src/backend/Agent.java
@@ -30,15 +30,37 @@ public abstract class Agent {
 		return dist<radius;
 	}
 	
+	
+	public String saveState() {
+        return String.format("%s;%d;%d;%d;%d;%d",
+            this.getClass().getSimpleName(),
+            x, y,
+            color.getRed(), color.getGreen(), color.getBlue());
+    }
+
+    public static Agent loadState(String state) {
+        String[] parts = state.split(";");
+        String className = parts[0];
+        int x = Integer.parseInt(parts[1]);
+        int y = Integer.parseInt(parts[2]);
+        int r = Integer.parseInt(parts[3]);
+        int g = Integer.parseInt(parts[4]);
+        int b = Integer.parseInt(parts[5]);
+        Color color = new Color(r, g, b);
+
+        // Create the specific agent type based on the class name
+        switch (className) {
+            case "Sheep":
+                return new Sheep(x, y, color);
+            // Add cases for other agent types here
+            default:
+                throw new IllegalArgumentException("Unknown agent type: " + className);
+        }
+    }
 	// Does whatever the agent does during a step
 	// then returns a boolean
 	// if false, agent dies at end of turn
 	// see step function in Simulator
 	public abstract boolean liveTurn(ArrayList<Agent> neighbors, Simulator world);
-
-	public static Agent fromString(String line) {
-		return null;
-	}
-	
-	
 }
+	
diff --git a/src/backend/Sheep.java b/src/backend/Sheep.java
index ece8a18..42fab0c 100644
--- a/src/backend/Sheep.java
+++ b/src/backend/Sheep.java
@@ -4,15 +4,15 @@ import java.awt.Color;
 import java.util.ArrayList;
 import java.util.Random;
 
-// example of basic animal.
-// do not hesitate to make it more complex
-// and DO add at least another species that interact with it
-// for example wolves that eat Sheep
 public class Sheep extends Agent {
 	
 	int hunger;
 	Random rand;
 	
+	public Sheep(int x, int y, Color color) {
+        super(x, y, color);
+    }
+	
 	Sheep(int x,int y){
 		//first we call the constructor of the superClass(Animal)
 		//with the values we want.
@@ -32,28 +32,38 @@ public class Sheep extends Agent {
 	public boolean liveTurn(ArrayList<Agent> neighbors, Simulator world) {
 		if(world.getCell(x, y)==1) {
 			world.setCell(x, y, 0);
+			hunger = 0; // Reset hunger if the sheep finds food
 		} else {
 			hunger++;
 		}
 		this.moveRandom();
-		return hunger>10;
+		return hunger <= 10; // Sheep survives if hunger is 10 or less
 	}
 
 	private void moveRandom() {
 		int direction = rand.nextInt(4);
-		if(direction == 0) {
-			x+=1;
-		}
-		if(direction == 1) {
-			y+=1;
-		}
-		if(direction == 2) {
-			x-=1;
-		}
-		if(direction == 3) {
-			y-=1;
+		switch(direction) {
+			case 0: x += 1; break;
+			case 1: y += 1; break;
+			case 2: x -= 1; break;
+			case 3: y -= 1; break;
 		}
 	}
 
+	// Parsing method to create Sheep from a string
+	public static Sheep parse(String line) {
+		String[] parts = line.split(";");
+		int x = Integer.parseInt(parts[0]);
+		int y = Integer.parseInt(parts[1]);
+		// We don't parse color here since Sheep is always white
+		Sheep sheep = new Sheep(x, y);
+		sheep.hunger = Integer.parseInt(parts[2]); // Parsing hunger value
+		return sheep;
+	}
+
+	@Override
+	public String toString() {
+		return x + ";" + y + ";" + hunger;
+	}
 
 }
diff --git a/src/backend/Simulator.java b/src/backend/Simulator.java
index 072e903..b742c72 100644
--- a/src/backend/Simulator.java
+++ b/src/backend/Simulator.java
@@ -1,5 +1,6 @@
 package backend;
 import java.util.ArrayList;
+import java.util.Random;
 
 import windowInterface.MyInterface;
 
@@ -7,13 +8,11 @@ public class Simulator extends Thread {
 
 	private MyInterface mjf;
 	
-	private final int COL_NUM = 100;
-	private final int LINE_NUM = 100;
-	private final int LIFE_TYPE_NUM = 4;
-	//Conway Radius : 1
-	private final int LIFE_AREA_RADIUS = 1;
-	//Animal Neighborhood Radius : 5
-	private final int ANIMAL_AREA_RADIUS = 2;
+    private boolean[][] grid; // 2D array representing the current state of the grid
+    private boolean[][] newGrid; // 2D array representing the next state of the grid
+    private int LINE_NUM;
+    private int COL_NUM;
+	
 	private ArrayList<Integer> fieldSurviveValues;
 	private ArrayList<Integer> fieldBirthValues;
 	
@@ -25,7 +24,7 @@ public class Simulator extends Thread {
 	private boolean clickActionFlag;
 	private int loopDelay = 150;
 
-    public int[][] grid;
+    private boolean running = false; // New flag to track if the thread is running
 
     public Simulator(MyInterface mjfParam) {
         mjf = mjfParam;
@@ -37,13 +36,16 @@ public class Simulator extends Thread {
         agents = new ArrayList<Agent>();
         fieldBirthValues = new ArrayList<Integer>();
         fieldSurviveValues = new ArrayList<Integer>();
+        
+        LINE_NUM = mjfParam.getX();
+        COL_NUM = mjfParam.getY();
+        grid = new boolean[LINE_NUM][COL_NUM];
+        newGrid = new boolean[LINE_NUM][COL_NUM];
 
-        grid = new int[LINE_NUM][COL_NUM];
-
-        // Default rule : Survive always, birth never
-        for (int i = 0; i < 9; i++) {
-            fieldSurviveValues.add(i);
-        }
+        // Default rule: Survive on 2 or 3 neighbors, birth on 3 neighbors
+        fieldSurviveValues.add(2);
+        fieldSurviveValues.add(3);
+        fieldBirthValues.add(3);
     }
 
     public int getWidth() {
@@ -54,81 +56,84 @@ public class Simulator extends Thread {
         return LINE_NUM;
     }
 
-	//Should probably stay as is
-	public void run() {
-		int stepCount=0;
-		while(!stopFlag) {
-			stepCount++;
-			makeStep();
-			mjf.update(stepCount);
-			try {
-				Thread.sleep(loopDelay);
-			} catch (InterruptedException e) {
-				e.printStackTrace();
-			}
-			while(pauseFlag && !stopFlag) {
-				try {
-					Thread.sleep(loopDelay);
-				} catch (InterruptedException e) {
-					e.printStackTrace();
-				}
-			}
-		}
-
-	}
+    // Runs the simulation
+    public void run() {
+        if (running) return; // Prevents the thread from being started more than once
+        running = true;
+        int stepCount = 0;
+        while (!stopFlag) {
+            stepCount++;
+            makeStep();
+            mjf.update(stepCount);
+            try {
+                Thread.sleep(loopDelay);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+            while (pauseFlag && !stopFlag) {
+                try {
+                    Thread.sleep(loopDelay);
+                } catch (InterruptedException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+        running = false; // Reset the running flag when the thread finishes
+    }
 
 	/**
 	 * method called at each step of the simulation
 	 * makes all the actions to go from one step to the other
 	 */
-    
     public void makeStep() {
-        int[][] newGrid = new int[LINE_NUM][COL_NUM];
+    	try {
+        for (Agent agent : agents) {
+            ArrayList<Agent> neighbors = getNeighboringAnimals(agent.getX(), agent.getY(), 2);
+            if (!agent.liveTurn(neighbors, this)) {
+                agents.remove(agent);
+            }
+        }
 
         for (int y = 0; y < LINE_NUM; y++) {
             for (int x = 0; x < COL_NUM; x++) {
-                int aliveNeighbors = countAliveNeighbors(x, y);
-
-                if (grid[y][x] == 1) {
-                    if (aliveNeighbors < 2 || aliveNeighbors > 3) {
-                        newGrid[y][x] = 0;
-                    } else {
-                        newGrid[y][x] = 1;
-                    }
+                int liveNeighbors = countLiveNeighbors(y, x);
+                if (grid[y][x]) {
+                    newGrid[y][x] = fieldSurviveValues.contains(liveNeighbors);
                 } else {
-                    if (aliveNeighbors == 3) {
-                        newGrid[y][x] = 1;
-                    } else {
-                        newGrid[y][x] = 0;
-                    }
+                    newGrid[y][x] = fieldBirthValues.contains(liveNeighbors);
                 }
             }
         }
-
+        boolean[][] temp = grid;
         grid = newGrid;
+        newGrid = temp;
+
+    	} catch (Exception e) {
+    		boolean[][] temp = grid;
+            grid = newGrid;
+            newGrid = temp;
+		}
     }
-    
 
-    private int countAliveNeighbors(int x, int y) {
-        int aliveCount = 0;
-        int[] dx = {-1, -1, -1, 0, 0, 1, 1, 1};
-        int[] dy = {-1, 0, 1, -1, 1, -1, 0, 1};
-
-        for (int i = 0; i < 8; i++) {
-            int nx = x + dx[i];
-            int ny = y + dy[i];
-
-            if (loopingBorder) {
-                nx = (nx + COL_NUM) % COL_NUM;
-                ny = (ny + LINE_NUM) % LINE_NUM;
-            }
-
-            if (nx >= 0 && nx < COL_NUM && ny >= 0 && ny < LINE_NUM) {
-                aliveCount += grid[ny][nx];
+    // Counts live neighbors
+    private int countLiveNeighbors(int y, int x) {
+        int count = 0;
+        int[] directions = {-1, 0, 1};
+        for (int i : directions) {
+            for (int j : directions) {
+                if (i == 0 && j == 0) continue;
+                int neighbory = y + i;
+                int neighborCol = x + j;
+                if (loopingBorder) {
+                    neighbory = (neighbory + LINE_NUM) % LINE_NUM;
+                    neighborCol = (neighborCol + COL_NUM) % COL_NUM;
+                }
+                if (isInBounds(neighbory, neighborCol) && grid[neighbory][neighborCol]) {
+                    count++;
+                }
             }
         }
-
-        return aliveCount;
+        return count;
     }
     
 	/*
@@ -152,8 +157,7 @@ public class Simulator extends Thread {
         if (clickActionFlag) {
             agents.add(new Sheep(x, y));
         } else {
-            int currentState = getCell(x, y);
-            setCell(x, y, currentState == 0 ? 1 : 0);
+            grid[x][y] = !grid[x][y];
         }
     }
     
@@ -164,10 +168,13 @@ public class Simulator extends Thread {
 	 * @return value of cell
 	 */
     public int getCell(int x, int y) {
-        if (x >= 0 && x < COL_NUM && y >= 0 && y < LINE_NUM) {
-            return grid[y][x];
-        }
-        return 0;
+    	int i =1;
+    	try {
+    		return grid[x][y] ? 1 : 0;
+    	}catch (Exception e) {
+    		i = 0;
+		}
+		return i;
     }
     
 	/**
@@ -202,9 +209,7 @@ public class Simulator extends Thread {
 	 * @param val to set in cell
 	 */
     public void setCell(int x, int y, int val) {
-        if (x >= 0 && x < COL_NUM && y >= 0 && y < LINE_NUM) {
-            grid[y][x] = val;
-        }
+        grid[x][y] = (val == 1);
     }
     
 	/**
@@ -215,14 +220,11 @@ public class Simulator extends Thread {
     public ArrayList<String> getSaveState() {
         ArrayList<String> saveState = new ArrayList<String>();
         for (int y = 0; y < LINE_NUM; y++) {
-            StringBuilder sb = new StringBuilder();
+            StringBuilder line = new StringBuilder();
             for (int x = 0; x < COL_NUM; x++) {
-                sb.append(grid[y][x]);
-                if (x < COL_NUM - 1) {
-                    sb.append(";");
-                }
+                line.append(grid[x][y] ? "1" : "0").append(";");
             }
-            saveState.add(sb.toString());
+            saveState.add(line.toString());
         }
         return saveState;
     }
@@ -232,16 +234,13 @@ public class Simulator extends Thread {
 	 * @param lines of file representing saved world state
 	 */
     public void loadSaveState(ArrayList<String> lines) {
-        if (lines.size() != LINE_NUM) {
-            return;
-        }
-        for (int y = 0; y < LINE_NUM; y++) {
+        if (lines.size() <= 0) return;
+
+        for (int y = 0; y < lines.size(); y++) {
             String[] lineElements = lines.get(y).split(";");
-            if (lineElements.length != COL_NUM) {
-                return;
-            }
-            for (int x = 0; x < COL_NUM; x++) {
-                grid[y][x] = Integer.parseInt(lineElements[x]);
+            for (int x = 0; x < lineElements.length; x++) {
+                int value = Integer.parseInt(lineElements[x]);
+                setCell(x, y, value);
             }
         }
     }
@@ -253,9 +252,10 @@ public class Simulator extends Thread {
 	 * to be alive in new state
 	 */
     public void generateRandom(float chanceOfLife) {
+        Random rand = new Random();
         for (int y = 0; y < LINE_NUM; y++) {
             for (int x = 0; x < COL_NUM; x++) {
-                grid[y][x] = Math.random() < chanceOfLife ? 1 : 0;
+                grid[x][y] = rand.nextFloat() < chanceOfLife;
             }
         }
     }
@@ -286,60 +286,44 @@ public class Simulator extends Thread {
 	 */
     public ArrayList<String> getRule() {
         ArrayList<String> rules = new ArrayList<String>();
-        StringBuilder surviveBuilder = new StringBuilder();
-        StringBuilder birthBuilder = new StringBuilder();
-
-        for (int value : fieldSurviveValues) {
-            surviveBuilder.append(value).append(";");
-        }
-        for (int value : fieldBirthValues) {
-            birthBuilder.append(value).append(";");
-        }
-
-        rules.add(surviveBuilder.toString());
-        rules.add(birthBuilder.toString());
+        rules.add("Survive: " + fieldSurviveValues.toString());
+        rules.add("Birth: " + fieldBirthValues.toString());
         return rules;
     }
 
+    // Loads the rules of the simulation
     public void loadRule(ArrayList<String> lines) {
-        if (lines.size() < 2) {
-            System.out.println("empty rule file");
-            return;
-        }
+        if (lines.size() <= 0) return;
 
         fieldSurviveValues.clear();
         fieldBirthValues.clear();
-
-        String[] surviveElements = lines.get(0).split(";");
-        for (String elem : surviveElements) {
-            if (!elem.isEmpty()) {
-                fieldSurviveValues.add(Integer.parseInt(elem));
-            }
-        }
-
-        String[] birthElements = lines.get(1).split(";");
-        for (String elem : birthElements) {
-            if (!elem.isEmpty()) {
-                fieldBirthValues.add(Integer.parseInt(elem));
+        for (String line : lines) {
+            if (line.startsWith("Survive: ")) {
+                String[] surviveRules = line.replace("Survive: ", "").replaceAll("[\\[\\]]", "").split(", ");
+                for (String rule : surviveRules) {
+                    fieldSurviveValues.add(Integer.parseInt(rule));
+                }
+            } else if (line.startsWith("Birth: ")) {
+                String[] birthRules = line.replace("Birth: ", "").replaceAll("[\\[\\]]", "").split(", ");
+                for (String rule : birthRules) {
+                    fieldBirthValues.add(Integer.parseInt(rule));
+                }
             }
         }
     }
 
     public ArrayList<String> getAgentsSave() {
-        ArrayList<String> saveState = new ArrayList<>();
+        ArrayList<String> agentsSave = new ArrayList<>();
         for (Agent agent : agents) {
-            saveState.add(agent.toString());
+            agentsSave.add(agent.saveState());
         }
-        return saveState;
+        return agentsSave;
     }
 
-    public void loadAgents(ArrayList<String> stringArray) {
+    public void loadAgents(ArrayList<String> lines) {
         agents.clear();
-        for (String line : stringArray) {
-            Agent agent = Agent.fromString(line);
-            if (agent != null) {
-                agents.add(agent);
-            }
+        for (String line : lines) {
+            agents.add(Agent.loadState(line));
         }
     }
 
@@ -350,4 +334,9 @@ public class Simulator extends Thread {
     public String clickActionName() {
         return clickActionFlag ? "sheep" : "cell";
     }
+    
+    // Checks if the coordinates are in bounds
+    private boolean isInBounds(int y, int x) {
+        return y >= 0 && y < LINE_NUM && x >= 0 && x < COL_NUM;
+    }
 }
\ No newline at end of file
diff --git a/src/windowInterface/MyInterface.java b/src/windowInterface/MyInterface.java
index 9990261..107ac31 100644
--- a/src/windowInterface/MyInterface.java
+++ b/src/windowInterface/MyInterface.java
@@ -44,7 +44,7 @@ public class MyInterface extends JFrame {
 	 */
 	public MyInterface() {
 		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
-		setBounds(10, 10, 700, 600);
+		setBounds(100, 100, 700, 600);
 		contentPane = new JPanel();
 		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
 		contentPane.setLayout(new BorderLayout(0, 0));