diff --git a/semestralka1/src/assets/obstacle_crawl_frames.h b/semestralka1/src/assets/obstacle_crawl_frames.h
new file mode 100644
index 0000000..d818847
--- /dev/null
+++ b/semestralka1/src/assets/obstacle_crawl_frames.h
@@ -0,0 +1,37 @@
+// src/assets/obstacle_crawl_frames.h
+#pragma once
+#include <cstring>
+
+// Crawl obstacle for CRAWL1 (2 lines tall)
+static const char *OBSTACLE_CRAWL1_FRAME[] = {
+    "#######",
+    "#######"
+};
+
+// Crawl obstacle for CRAWL2 (4 lines tall)
+static const char *OBSTACLE_CRAWL2_FRAME[] = {
+    "########",
+    "########",
+    "########",
+    "########"
+};
+
+enum class CrawlObstacleType { Crawl1 = 0, Crawl2, COUNT };
+
+static const char **OBSTACLE_CRAWL_FRAMES[] = { OBSTACLE_CRAWL1_FRAME, OBSTACLE_CRAWL2_FRAME };
+
+// Crawl1 dimensions and collision
+static const int OBSTACLE_CRAWL1_FRAME_HEIGHT = sizeof(OBSTACLE_CRAWL1_FRAME) / sizeof(OBSTACLE_CRAWL1_FRAME[0]);
+static const int OBSTACLE_CRAWL1_FRAME_WIDTH = std::strlen(OBSTACLE_CRAWL1_FRAME[0]);
+static const int OBSTACLE_CRAWL1_COLLISION_LEFT_OFFSET = 0;
+static const int OBSTACLE_CRAWL1_COLLISION_RIGHT_OFFSET = 0;
+static const int OBSTACLE_CRAWL1_COLLISION_WIDTH = OBSTACLE_CRAWL1_FRAME_WIDTH - (OBSTACLE_CRAWL1_COLLISION_LEFT_OFFSET + OBSTACLE_CRAWL1_COLLISION_RIGHT_OFFSET);
+static const int OBSTACLE_CRAWL1_COLLISION_HEIGHT = OBSTACLE_CRAWL1_FRAME_HEIGHT;
+
+// Crawl2 dimensions and collision
+static const int OBSTACLE_CRAWL2_FRAME_HEIGHT = sizeof(OBSTACLE_CRAWL2_FRAME) / sizeof(OBSTACLE_CRAWL2_FRAME[0]);
+static const int OBSTACLE_CRAWL2_FRAME_WIDTH = std::strlen(OBSTACLE_CRAWL2_FRAME[0]);
+static const int OBSTACLE_CRAWL2_COLLISION_LEFT_OFFSET = 0;
+static const int OBSTACLE_CRAWL2_COLLISION_RIGHT_OFFSET = 0;
+static const int OBSTACLE_CRAWL2_COLLISION_WIDTH = OBSTACLE_CRAWL2_FRAME_WIDTH - (OBSTACLE_CRAWL2_COLLISION_LEFT_OFFSET + OBSTACLE_CRAWL2_COLLISION_RIGHT_OFFSET);
+static const int OBSTACLE_CRAWL2_COLLISION_HEIGHT = OBSTACLE_CRAWL2_FRAME_HEIGHT;
diff --git a/semestralka1/src/game/collision.h b/semestralka1/src/game/collision.h
new file mode 100644
index 0000000..ac5c712
--- /dev/null
+++ b/semestralka1/src/game/collision.h
@@ -0,0 +1,64 @@
+// src/game/collision.h
+#pragma once
+#include "../render/player_positioning.h"
+#include "../render/player.h"
+#include "../assets/character_walk_frames.h"
+#include "../assets/character_run_frames.h"
+#include "../assets/character_crawl_frames.h"
+
+// Simple obstacle representation
+struct Obstacle {
+    int x;
+    int y;
+    int width;
+    int height;
+};
+
+// Axis-aligned bounding-box collision
+inline bool check_collision(const CharacterPosition& player,
+                            MovementType movement,
+                            const Obstacle& obs) {
+    int player_x = player.x;
+    int player_y = player.y;
+    int box_x = 0, box_w = 0, box_h = 0;
+
+    switch (movement) {
+    case MovementType::Walk:
+        box_x = player_x + CHARACTER_WALK_COLLISION_LEFT_OFFSET;
+        box_w = CHARACTER_WALK_COLLISION_WIDTH;
+        box_h = CHARACTER_WALK_FRAME_HEIGHT;
+        break;
+    case MovementType::Run:
+        box_x = player_x + CHARACTER_RUN_COLLISION_LEFT_OFFSET;
+        box_w = CHARACTER_RUN_COLLISION_WIDTH;
+        box_h = CHARACTER_RUN_COLLISION_HEIGHT;
+        break;
+    case MovementType::Crawl1:
+        box_x = player_x + CHARACTER_CRAWL1_COLLISION_LEFT_OFFSET;
+        box_w = CHARACTER_CRAWL1_COLLISION_WIDTH;
+        box_h = CHARACTER_CRAWL1_COLLISION_HEIGHT;
+        break;
+    case MovementType::Crawl2:
+        box_x = player_x + CHARACTER_CRAWL2_COLLISION_LEFT_OFFSET;
+        box_w = CHARACTER_CRAWL2_COLLISION_WIDTH;
+        box_h = CHARACTER_CRAWL2_COLLISION_HEIGHT;
+        break;
+    }
+
+    // Player's bounding box
+    int player_left = box_x;
+    int player_right = player_left + box_w;
+    int player_top = player_y;
+    int player_bottom = player_top + box_h;
+
+    // Obstacle bounding box
+    int obs_left = obs.x;
+    int obs_right = obs.x + obs.width;
+    int obs_top = obs.y;
+    int obs_bottom = obs.y + obs.height;
+
+    // Simple overlap check
+    bool horizontal = player_left < obs_right && player_right > obs_left;
+    bool vertical = player_top < obs_bottom && player_bottom > obs_top;
+    return horizontal && vertical;
+}
diff --git a/semestralka1/src/game/obstacle_manager.h b/semestralka1/src/game/obstacle_manager.h
new file mode 100644
index 0000000..10e20be
--- /dev/null
+++ b/semestralka1/src/game/obstacle_manager.h
@@ -0,0 +1,45 @@
+// src/game/obstacle_manager.h
+#pragma once
+#include "../game/collision.h"
+#include "../assets/obstacle_crawl_frames.h"
+
+// One movable obstacle
+struct MovingObstacle {
+    Obstacle data;
+    CrawlObstacleType type;
+    bool active;
+};
+
+// Fixed obstacle pool
+constexpr int MAX_OBSTACLES = 6;
+static MovingObstacle obstacle_pool[MAX_OBSTACLES];
+
+// Create / reset obstacle in one slot
+inline void spawn_obstacle(CrawlObstacleType type, int x_start) {
+    for (int i = 0; i < MAX_OBSTACLES; i++) {
+        if (!obstacle_pool[i].active) {
+            obstacle_pool[i].active = true;
+            obstacle_pool[i].type = type;
+            obstacle_pool[i].data.x = x_start;
+            obstacle_pool[i].data.y = 0; // hangs from ceiling
+            if (type == CrawlObstacleType::Crawl1) {
+                obstacle_pool[i].data.width  = OBSTACLE_CRAWL1_COLLISION_WIDTH;
+                obstacle_pool[i].data.height = OBSTACLE_CRAWL1_COLLISION_HEIGHT;
+            } else {
+                obstacle_pool[i].data.width  = OBSTACLE_CRAWL2_COLLISION_WIDTH;
+                obstacle_pool[i].data.height = OBSTACLE_CRAWL2_COLLISION_HEIGHT;
+            }
+            break;
+        }
+    }
+}
+
+// Update X positions; mark inactive if offscreen
+inline void update_obstacles(int shift_speed) {
+    for (int i = 0; i < MAX_OBSTACLES; i++) {
+        if (!obstacle_pool[i].active) continue;
+        obstacle_pool[i].data.x -= shift_speed;
+        if (obstacle_pool[i].data.x + obstacle_pool[i].data.width < 0)
+            obstacle_pool[i].active = false;
+    }
+}