diff --git a/engine b/engine
index 0bc85f8..0870823 160000
--- a/engine
+++ b/engine
@@ -1 +1 @@
-Subproject commit 0bc85f8c8e70056c1efbb378df8dfd64e1391215
+Subproject commit 087082334693f8290a73b76bd0627abec926314b
diff --git a/main.cpp b/main.cpp
index 2dc44a9..dce6ba2 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,53 +1,145 @@
+#include<math.h>
+#include<iostream>
+
 #include "engine.hpp"
 
 static int SCR_HEIGHT = 600;
 static int SCR_WIDTH = 800;
 
-const char *cubeSource = "/cube2.obj";
-const char *catSource = "/cat.obj";
-const char *benchSource = "/bench.obj";
-
 const char *vertexShaderSource = "/vertex/standart.vshader";
 const char *fragmentShaderSource = "/fragment/standart.fshader";
 
+const char *cubeSource = "/cube.obj";
+
+class MovingBall : public Object {
+ private:
+    float MIN_VELOCITY = 0.001;
+
+ public:
+    Vec3 velocity;
+    float bounciness = 1;
+    float friction = 0;
+
+    void Update(float dt) override {
+        transform->Translate(velocity * dt);
+        Vec3 rotationAxis = cross(normalize(velocity), Vec3(0, -1, 0));
+        float angle = length(velocity) * dt / transform->GetScale().x;
+        Mat4 rotation = transform->GetRotation();
+        transform->Rotate(inverse(rotation));
+        transform->Rotate(angle, rotationAxis);
+        transform->Rotate(rotation);
+        velocity *= pow(1 - friction, dt);
+        if (length(velocity) < MIN_VELOCITY) {
+            velocity = Vec3(0, 0, 0);
+        }
+    }
+
+    MovingBall(Vec3 position, ShaderProgram * shaderProgram,
+     std::string diffuseSource, std::string specularSource = "") {
+        this->renderData = new RenderData();
+        this->renderData->model = Model::loadFromFile("/shar_152.obj");  // Model::GetSphere();
+        this->renderData->model->shader = shaderProgram;
+
+        auto images = std::vector<std::string>();
+        images.push_back(diffuseSource);
+        if (specularSource != "") {
+            images.push_back(specularSource);
+        }
+        this->renderData->material = {
+            4.f,
+            Texture(images),
+        };
+
+        bindRenderData(this->renderData);
 
-Object* initModel();
+        this->collider = new Collider{Sphere{
+            Vec3(0.0),
+            1.0f,
+        }};
+
+        transform = new Transform(position, Vec3(1., 1., 1.), Mat4(1.0));
+    }
+};
+
+class GameManager : public Object {
+ public:
+    std::vector<MovingBall*> balls;
+    float minX = -7, maxX = 7, minZ = -7, maxZ = 7;
+
+    void Update(float dt) override {
+        for (int i = 0; i < balls.size(); ++i) {
+            auto ball = balls[i];
+            Vec3 pos = ball->transform->GetTranslation();
+            if (pos.x < minX) {
+                ball->transform->Translate((1 + ball->bounciness) * Vec3(minX - pos.x, 0, 0));
+                ball->velocity = Vec3(- ball->velocity.x, 0, ball->velocity.z) * ball->bounciness;
+            }
+            if (pos.x > maxX) {
+                ball->transform->Translate((1 + ball->bounciness) * Vec3(maxX - pos.x, 0, 0));
+                ball->velocity = Vec3(- ball->velocity.x, 0, ball->velocity.z) * ball->bounciness;
+            }
+            if (pos.z < minZ) {
+                ball->transform->Translate((1 + ball->bounciness) * Vec3(0, 0, minZ - pos.z));
+                ball->velocity = Vec3(ball->velocity.x, 0, - ball->velocity.z) * ball->bounciness;
+            }
+            if (pos.z > maxZ) {
+                ball->transform->Translate((1 + ball->bounciness) * Vec3(0, 0, maxZ - pos.z));
+                ball->velocity = Vec3(ball->velocity.x, 0, - ball->velocity.z) * ball->bounciness;
+            }
+            for (int j = i + 1; j < balls.size(); ++j) {
+                auto ball2 = balls[j];
+                if (ball->collider->Collide(*ball->transform, ball2->collider, *ball2->transform)) {
+                    // collision
+                    Vec3 pos2 = ball2->transform->GetTranslation();
+                    Vec3 center = (pos + pos2) * 0.5f;  // collision point
+                    Vec3 speed = ball->velocity - ball2->velocity;  // approach speed of 2 balls
+                    Vec3 v = pos - center;  // vector towards center of collision
+                    float dotProduct = speed.x * v.x + speed.z * v.z;
+                    float proj = dotProduct / length(v);  // projection of speed vector on collision line
+                    Vec3 impulseChange = normalize(v) * proj * (1 + ball->bounciness * ball2->bounciness);
+                    ball->velocity -= impulseChange * 0.5f;
+                    ball2->velocity += impulseChange * 0.5f;
+                    ball->transform->Translate(v * (ball->transform->GetScale().x / length(v) - 1));
+                    ball2->transform->Translate(v * (1 - ball2->transform->GetScale().x / length(v)));
+                }
+            }
+        }
+    }
+    explicit GameManager(std::vector<MovingBall*> balls) {
+        this->balls = balls;
+    }
+};
+
+MovingBall *newBall(Vec3 position, Vec3 velocity,
+        ShaderProgram *sp, std::string diffuseSource, std::string specularSource);
 
 int main() {
     auto engine = Engine(SCR_WIDTH, SCR_HEIGHT);
-    Object* testObj = initModel();
-    engine.AddObject<>(testObj);
-    engine.Run(SCR_WIDTH, SCR_HEIGHT);
-}
 
-Object* initModel() {
-    // build and compile our shader program ------------------------------------
     Shader vShader = Shader(VertexShader, vertexShaderSource);
     Shader fShader = Shader(FragmentShader, fragmentShaderSource);
+    ShaderProgram *shaderProgram = new ShaderProgram(vShader, fShader);
 
-    // init a model
-    Model * model = Model::loadFromFile(catSource);
+    std::vector<MovingBall*> balls;
+    int ballsCount = 5;
 
-    auto obj = new Object();
-    obj->renderData = new RenderData();
-    obj->renderData->model = model;
-    obj->renderData->model->shader = new ShaderProgram(vShader, fShader);
+    for (int i = 0; i < ballsCount; ++i) {
+        MovingBall *sphere = newBall(Vec3(i * 2 - 5, -12, -i), Vec3(3, 0, 1 + i),
+         shaderProgram, "/152.png", "/cat_specular.png");
+        balls.push_back(sphere);
+        engine.AddObject<>(sphere);
+    }
 
-    obj->transform = new Transform(glm::vec3(0.f, -3.f, -8.f), glm::vec3(.1f, .1f, .1f), glm::mat4(1.0));
-    obj->transform->Rotate(1.67f, glm::vec3(-1.f, 0.f, 0.f));
-    auto render_data = obj->renderData;
+    GameManager *gameManager = new GameManager(balls);
 
-    bindRenderData(render_data);
+    engine.AddObject(gameManager);
 
-    // Maybe this can be less clunky?
-    // Perhaps variadic functions?
-    auto images = std::vector<std::string>();
-    images.push_back("/Cat_diffuse.png");
-    images.push_back("/Cat_specular.png");
-    obj->renderData->material = {
-        4.f,
-        Texture(images),
-    };
+    engine.Run(SCR_WIDTH, SCR_HEIGHT);
+}
 
-    return obj;
+MovingBall *newBall(Vec3 position, Vec3 velocity,
+        ShaderProgram *sp, std::string diffuseSource, std::string specularSource) {
+    MovingBall* ball = new MovingBall(position, sp, diffuseSource, specularSource);
+    ball->velocity = velocity;
+    return ball;
 }
diff --git a/resources/models/shar_152.obj b/resources/models/shar_152.obj
new file mode 100644
index 0000000..26f0fc2
--- /dev/null
+++ b/resources/models/shar_152.obj
@@ -0,0 +1,632 @@
+# Blender 4.0.1
+# www.blender.org
+mtllib shar_152.mtl
+o Roundcube
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