diff --git a/src/Avans.FlatGalaxy.Simulation/Commands/AddAsteroidCommand.cs b/src/Avans.FlatGalaxy.Simulation/Commands/AddAsteroidCommand.cs
new file mode 100644
index 0000000..f1547ec
--- /dev/null
+++ b/src/Avans.FlatGalaxy.Simulation/Commands/AddAsteroidCommand.cs
@@ -0,0 +1,12 @@
+using Avans.FlatGalaxy.Simulation.Commands.Common;
+
+namespace Avans.FlatGalaxy.Simulation.Commands
+{
+    public class AddAsteroidCommand : ICommand
+    {
+        public void Execute(ISimulator simulator)
+        {
+            simulator.AddAsteroid();
+        }
+    }
+}
diff --git a/src/Avans.FlatGalaxy.Simulation/Commands/CollisionSwitchCommand.cs b/src/Avans.FlatGalaxy.Simulation/Commands/CollisionSwitchCommand.cs
new file mode 100644
index 0000000..35ebc32
--- /dev/null
+++ b/src/Avans.FlatGalaxy.Simulation/Commands/CollisionSwitchCommand.cs
@@ -0,0 +1,12 @@
+using Avans.FlatGalaxy.Simulation.Commands.Common;
+
+namespace Avans.FlatGalaxy.Simulation.Commands
+{
+    public class CollisionSwitchCommand : ICommand
+    {
+        public void Execute(ISimulator simulator)
+        {
+            simulator.SwitchCollisionAlgo();
+        }
+    }
+}
diff --git a/src/Avans.FlatGalaxy.Simulation/Commands/CollisionVisibilityCommand.cs b/src/Avans.FlatGalaxy.Simulation/Commands/CollisionVisibilityCommand.cs
new file mode 100644
index 0000000..9695350
--- /dev/null
+++ b/src/Avans.FlatGalaxy.Simulation/Commands/CollisionVisibilityCommand.cs
@@ -0,0 +1,12 @@
+using Avans.FlatGalaxy.Simulation.Commands.Common;
+
+namespace Avans.FlatGalaxy.Simulation.Commands
+{
+    public class CollisionVisibilityCommand : ICommand
+    {
+        public void Execute(ISimulator simulator)
+        {
+            simulator.ToggleCollisionVisibility();
+        }
+    }
+}
diff --git a/src/Avans.FlatGalaxy.Simulation/Commands/Common/ICommand.cs b/src/Avans.FlatGalaxy.Simulation/Commands/Common/ICommand.cs
new file mode 100644
index 0000000..d8d0a71
--- /dev/null
+++ b/src/Avans.FlatGalaxy.Simulation/Commands/Common/ICommand.cs
@@ -0,0 +1,7 @@
+namespace Avans.FlatGalaxy.Simulation.Commands.Common
+{
+    public interface ICommand
+    {
+        void Execute(ISimulator simulator);
+    }
+}
diff --git a/src/Avans.FlatGalaxy.Simulation/Commands/PauseCommand.cs b/src/Avans.FlatGalaxy.Simulation/Commands/PauseCommand.cs
new file mode 100644
index 0000000..cf4481f
--- /dev/null
+++ b/src/Avans.FlatGalaxy.Simulation/Commands/PauseCommand.cs
@@ -0,0 +1,12 @@
+using Avans.FlatGalaxy.Simulation.Commands.Common;
+
+namespace Avans.FlatGalaxy.Simulation.Commands
+{
+    public class PauseCommand : ICommand
+    {
+        public void Execute(ISimulator simulator)
+        {
+            simulator.Pause();
+        }
+    }
+}
diff --git a/src/Avans.FlatGalaxy.Simulation/Commands/RemoveAsteroidCommand.cs b/src/Avans.FlatGalaxy.Simulation/Commands/RemoveAsteroidCommand.cs
new file mode 100644
index 0000000..cdb25e0
--- /dev/null
+++ b/src/Avans.FlatGalaxy.Simulation/Commands/RemoveAsteroidCommand.cs
@@ -0,0 +1,12 @@
+using Avans.FlatGalaxy.Simulation.Commands.Common;
+
+namespace Avans.FlatGalaxy.Simulation.Commands
+{
+    public class RemoveAsteroidCommand : ICommand
+    {
+        public void Execute(ISimulator simulator)
+        {
+            simulator.RemoveAsteroid();
+        }
+    }
+}
diff --git a/src/Avans.FlatGalaxy.Simulation/Commands/RestoreCommand.cs b/src/Avans.FlatGalaxy.Simulation/Commands/RestoreCommand.cs
new file mode 100644
index 0000000..18ebc12
--- /dev/null
+++ b/src/Avans.FlatGalaxy.Simulation/Commands/RestoreCommand.cs
@@ -0,0 +1,12 @@
+using Avans.FlatGalaxy.Simulation.Commands.Common;
+
+namespace Avans.FlatGalaxy.Simulation.Commands
+{
+    public class RestoreCommand : ICommand
+    {
+        public void Execute(ISimulator simulator)
+        {
+            simulator.Restore();
+        }
+    }
+}
diff --git a/src/Avans.FlatGalaxy.Simulation/Commands/ResumeCommand.cs b/src/Avans.FlatGalaxy.Simulation/Commands/ResumeCommand.cs
new file mode 100644
index 0000000..9c09e83
--- /dev/null
+++ b/src/Avans.FlatGalaxy.Simulation/Commands/ResumeCommand.cs
@@ -0,0 +1,12 @@
+using Avans.FlatGalaxy.Simulation.Commands.Common;
+
+namespace Avans.FlatGalaxy.Simulation.Commands
+{
+    public class ResumeCommand : ICommand
+    {
+        public void Execute(ISimulator simulator)
+        {
+            simulator.Resume();
+        }
+    }
+}
diff --git a/src/Avans.FlatGalaxy.Simulation/Commands/SpeedDownCommand.cs b/src/Avans.FlatGalaxy.Simulation/Commands/SpeedDownCommand.cs
new file mode 100644
index 0000000..10d9746
--- /dev/null
+++ b/src/Avans.FlatGalaxy.Simulation/Commands/SpeedDownCommand.cs
@@ -0,0 +1,19 @@
+using Avans.FlatGalaxy.Simulation.Commands.Common;
+
+namespace Avans.FlatGalaxy.Simulation.Commands
+{
+    public class SpeedDownCommand : ICommand
+    {
+        private readonly double _speedDiff;
+
+        public SpeedDownCommand(double speedDiff = ISimulator.SpeedDiff)
+        {
+            _speedDiff = speedDiff;
+        }
+
+        public void Execute(ISimulator simulator)
+        {
+            simulator.SpeedDown(_speedDiff);
+        }
+    }
+}
diff --git a/src/Avans.FlatGalaxy.Simulation/Commands/SpeedUpCommand.cs b/src/Avans.FlatGalaxy.Simulation/Commands/SpeedUpCommand.cs
new file mode 100644
index 0000000..1cdb1cd
--- /dev/null
+++ b/src/Avans.FlatGalaxy.Simulation/Commands/SpeedUpCommand.cs
@@ -0,0 +1,19 @@
+using Avans.FlatGalaxy.Simulation.Commands.Common;
+
+namespace Avans.FlatGalaxy.Simulation.Commands
+{
+    public class SpeedUpCommand : ICommand
+    {
+        private readonly double _speedDiff;
+
+        public SpeedUpCommand(double speedDiff = ISimulator.SpeedDiff)
+        {
+            _speedDiff = speedDiff;
+        }
+
+        public void Execute(ISimulator simulator)
+        {
+            simulator.SpeedUp(_speedDiff);
+        }
+    }
+}
diff --git a/src/Avans.FlatGalaxy.Simulation/Extensions/ListExtensions.cs b/src/Avans.FlatGalaxy.Simulation/Extensions/ListExtensions.cs
new file mode 100644
index 0000000..a68ddaa
--- /dev/null
+++ b/src/Avans.FlatGalaxy.Simulation/Extensions/ListExtensions.cs
@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Avans.FlatGalaxy.Simulation.Extensions
+{
+    public static class ListExtensions
+    {
+        public static T Random<T>(this IEnumerable<T> source)
+        {
+            return source.Random(1).Single();
+        }
+
+        public static IEnumerable<T> Random<T>(this IEnumerable<T> source, int count)
+        {
+            return source.Shuffle().Take(count);
+        }
+
+        public static IEnumerable<T> Shuffle<T>(this IEnumerable<T> source)
+        {
+            return source.OrderBy(x => Guid.NewGuid());
+        }
+    }
+}
diff --git a/src/Avans.FlatGalaxy.Simulation/ISimulator.cs b/src/Avans.FlatGalaxy.Simulation/ISimulator.cs
index 42fc251..334a102 100644
--- a/src/Avans.FlatGalaxy.Simulation/ISimulator.cs
+++ b/src/Avans.FlatGalaxy.Simulation/ISimulator.cs
@@ -9,14 +9,32 @@ public interface ISimulator
 
         public const int Height = 600;
 
+        public const double SpeedDiff = 0.1;
+
+        public const double BookmarkTime = 5000;
+
         Galaxy Galaxy { get; set; }
 
         QuadTree QuadTree { get; set; }
 
+        bool CollisionVisible { get; set; }
+
         void Resume();
 
         void Pause();
 
         void Restore();
+
+        void SpeedUp(double speed);
+
+        void SpeedDown(double speed);
+
+        void SwitchCollisionAlgo();
+
+        void AddAsteroid();
+
+        void RemoveAsteroid();
+
+        void ToggleCollisionVisibility();
     }
 }
diff --git a/src/Avans.FlatGalaxy.Simulation/Simulator.cs b/src/Avans.FlatGalaxy.Simulation/Simulator.cs
index 2d19973..48c73e5 100644
--- a/src/Avans.FlatGalaxy.Simulation/Simulator.cs
+++ b/src/Avans.FlatGalaxy.Simulation/Simulator.cs
@@ -1,11 +1,16 @@
 using System;
+using System.Drawing;
+using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using Avans.FlatGalaxy.Models;
+using Avans.FlatGalaxy.Models.CelestialBodies;
+using Avans.FlatGalaxy.Models.CelestialBodies.States;
 using Avans.FlatGalaxy.Simulation.Bookmark;
 using Avans.FlatGalaxy.Simulation.Bookmark.Common;
 using Avans.FlatGalaxy.Simulation.Collision;
 using Avans.FlatGalaxy.Simulation.Data;
+using Avans.FlatGalaxy.Simulation.Extensions;
 
 namespace Avans.FlatGalaxy.Simulation
 {
@@ -17,7 +22,7 @@ public class Simulator : ISimulator
 
         private DateTime _lastTick = DateTime.UtcNow;
 
-        private int _speed = 50;
+        private double _speed = 25;
         private bool _running = false;
         private DateTime _lastBookmark;
 
@@ -37,6 +42,8 @@ public Simulator(Galaxy galaxy)
 
         public QuadTree QuadTree { get; set; }
 
+        public bool CollisionVisible { get; set; } = false;
+
         public void Resume()
         {
             if (_running) return;
@@ -60,7 +67,45 @@ public void Restore()
             _caretaker.Undo();
         }
 
-        public void Tick(CancellationToken token)
+        public void SpeedUp(double speed)
+        {
+            _speed += speed;
+        }
+
+        public void SpeedDown(double speed)
+        {
+            _speed -= speed;
+        }
+
+        public void SwitchCollisionAlgo()
+        {
+            _collisionHandler.Toggle();
+        }
+
+        public void ToggleCollisionVisibility()
+        {
+            CollisionVisible = !CollisionVisible;
+        }
+
+        public void AddAsteroid()
+        {
+            var rnd = new Random();
+            var x = rnd.NextDouble() * ISimulator.Width;
+            var y = rnd.NextDouble() * ISimulator.Height;
+            var vx = rnd.NextDouble() * 10 - 5;
+            var vy = rnd.NextDouble() * 10 - 5;
+            var radius = rnd.Next(2, 6);
+
+            Galaxy.Add(new Asteroid(x, y, vx, vy, radius, Color.Black, new NullCollisionState()));
+        }
+
+        public void RemoveAsteroid()
+        {
+            var asteroid = Galaxy.CelestialBodies.OfType<Asteroid>().Random();
+            Galaxy.Remove(asteroid);
+        }
+
+        private void Tick(CancellationToken token)
         {
             if (_running)
             {
@@ -74,7 +119,7 @@ public void Tick(CancellationToken token)
                     _collisionHandler.Detect(this);
 
                     _lastTick = DateTime.UtcNow;
-                    if ((DateTime.UtcNow - _lastBookmark).TotalSeconds >= 1)
+                    if ((DateTime.UtcNow - _lastBookmark).TotalSeconds >= ISimulator.BookmarkTime)
                     {
                         _caretaker.Save();
                         _lastBookmark = DateTime.UtcNow;