diff --git a/main.c b/main.c
index 4a50cc5..494270f 100644
--- a/main.c
+++ b/main.c
@@ -1,11 +1,11 @@
 #include "include/raylib.h"
 #include <stdio.h>
 
-
+//-------------------------------------------------------------------------------------------------------------------------------------
 typedef struct Block {
-    Vector2 position;
+    Vector2 position, size;
     int form, onGround;
-    float speed;
+    float speed, step;
 
     struct Block *next;
 } Block;
@@ -14,9 +14,11 @@ typedef struct Block {
 void createBlock(Block **head) {
     Block *block = MemAlloc(sizeof(Block));
     block->position = (Vector2){ 400, -40 };
+    block->size = (Vector2){ 20, 20 };
     block->form = 1;
     block->onGround = 0;
-    block->speed = 2;
+    block->speed = 4;
+    block->step = 20;
     block->next = NULL;
 
     // Falls die Liste leer ist
@@ -50,22 +52,59 @@ int main(void) {
     SetTargetFPS(60);
 
     while (!WindowShouldClose()) {
+        //-------------------------------------------------------------------------------------------------------------------------------------
         // UPDATE GAME LOGIC
+        // INPUT
         Block *currentBlock = block;
         // Alle Blöcke fallen lassen
         while (currentBlock != NULL) {
             // Wenn Block noch nicht auf Boden, dann fallen
             if (currentBlock->onGround == 0) {
-                
 
-                if (currentBlock->position.y < screenHeight - 20) {
-                    currentBlock->position.y += currentBlock->speed;
-                } else {
+                // MOVEMENT -------------------------------------------------
+                if (IsKeyPressed(KEY_LEFT)) {
+                    currentBlock->position.x -= currentBlock->step;
+                }
+
+                if (IsKeyPressed(KEY_RIGHT)) {
+                    currentBlock->position.x += currentBlock->step;
+                }
+                // ----------------------------------------------------------
+                // Kollision gegen anderen Block checken
+
+                float nextY = currentBlock->position.y + currentBlock->speed;
+
+                if (nextY > screenHeight - currentBlock->size.y) {
+                    currentBlock->position.y = screenHeight - currentBlock->size.y;
                     blockMoving = 0;
                     currentBlock->onGround = 1;
                 }
+                else {
+                    Rectangle nextRect = { currentBlock->position.x, nextY, currentBlock->size.x, currentBlock->size.y };
 
+                    int collided = 0;
+                    Block *collisionCheck = block;
+                    while (collisionCheck != NULL) {
+                        // Nur gegen andere, bereits gelandete Blöcke prüfen (und nicht gegen sich selbst!)
+                        if (collisionCheck != currentBlock && collisionCheck->onGround == 1) {
+                            Rectangle otherRect = { collisionCheck->position.x, collisionCheck->position.y, collisionCheck->size.x, collisionCheck->size.y };
+                            
+                            if (CheckCollisionRecs(nextRect, otherRect)) {
+                                collided = 1;
+                                break;
+                            }
+                        }
+                        collisionCheck = collisionCheck->next;
+                    }
 
+                    if (collided) {
+                        blockMoving = 0;
+                        currentBlock->onGround = 1;
+                    }
+                    else {
+                        currentBlock->position.y = nextY;
+                    }
+                }              
 
             }
 
@@ -79,6 +118,7 @@ int main(void) {
             blockMoving = 1;
         }
 
+        //-------------------------------------------------------------------------------------------------------------------------------------
         // ZEICHNEN
         BeginDrawing();
             ClearBackground(RAYWHITE);
@@ -86,16 +126,26 @@ int main(void) {
             DrawFPS(20, 20);
             DrawText(TextFormat("Blocks: %i", blockCounter), 20, 40, 20, GREEN);
 
+            // BLOCK ZEICHNEN
             currentBlock = block;
             while (currentBlock != NULL) {
-                DrawRectangleV(currentBlock->position, (Vector2){20, 20}, BLUE);
+                DrawRectangleV(currentBlock->position, currentBlock->size, BLUE);
                 currentBlock = currentBlock->next;
             }
 
         EndDrawing();
+        //-------------------------------------------------------------------------------------------------------------------------------------
     }
 
 
+    // Alle Blöcke im Speicher freigeben
+    Block *currentBlock = block;
+    while (currentBlock != NULL) {
+        Block *nextBlock = currentBlock->next;
+        MemFree(currentBlock);
+        currentBlock = nextBlock;
+    }
+
     CloseWindow();
     return 0;
 }
\ No newline at end of file