diff --git a/js/FileLoader.js b/js/FileLoader.js
new file mode 100644
index 0000000..5dfefbd
--- /dev/null
+++ b/js/FileLoader.js
@@ -0,0 +1,28 @@
+export default class FileLoader
+{
+    constructor(filename)
+    {
+        this.filename = filename;
+        this.content = '';
+        this.loadContent();
+    }
+
+    getContent()
+    {
+        return this.content;
+    }
+
+    loadContent()
+    {
+        let request = new XMLHttpRequest();
+
+        request.onreadystatechange = () => {
+            if (request.status === 200 && request.readyState === 4) {
+                this.content = request.responseText;
+            }
+        };
+
+        request.open('GET', this.filename, false);
+        request.send();
+    }
+}
\ No newline at end of file
diff --git a/js/Movable.js b/js/Movable.js
index 62cd10b..fa518e2 100644
--- a/js/Movable.js
+++ b/js/Movable.js
@@ -10,6 +10,7 @@ export default class Movable
         };
         this.position = new GeometryPoint();
         this.speed = speed;
+        this.jumpHeight = 35;
         this.fallSpeed = 0;
     }
 
@@ -39,6 +40,39 @@ export default class Movable
         return this.animations[this.currentAnimation].getRect();
     }
 
+    getPositionFootLeft()
+    {
+        return new GeometryPoint(
+            this.position.x - this.animations[this.currentAnimation].getWidth() * 0.5, this.position.y
+        );
+    }
+
+    getPositionFootRight()
+    {
+        return new GeometryPoint(
+            this.position.x + this.animations[this.currentAnimation].getWidth() * 0.5, this.position.y
+        );
+    }
+
+    jump()
+    {
+        this.fallSpeed -= this.jumpHeight;
+        this.isJumping = true;
+    }
+
+    getFootHeight()
+    {
+        return new GeometryPoint(
+            this.position.x,
+            this.position.y + this.animations[this.currentAnimation].getHeight()
+        );
+    }
+
+    setFootHeight(height)
+    {
+        this.position.y = height - this.animations[this.currentAnimation].getHeight();
+    }
+
     draw(context)
     {
         this.animations[this.currentAnimation].setFootPosition(this.position.x, this.position.y);
diff --git a/js/MrCroc.js b/js/MrCroc.js
index 341fd81..492d22a 100644
--- a/js/MrCroc.js
+++ b/js/MrCroc.js
@@ -4,10 +4,11 @@ import RetroAnimation from "./retro/RetroAnimation.js";
 export default class MrCroc extends Movable
 {
     constructor() {
-        super(new RetroAnimation('graphics/mr-croc-walk-right.png', 2, 5), 5);
-
-        this.addAnimation('WALK_RIGHT', new RetroAnimation('graphics/mr-croc-walk-right.png', 2, 5, 10));
-        this.addAnimation('WALK_LEFT', new RetroAnimation('graphics/mr-croc-walk-left.png', 2, 5, 10));
+        let SCALE = 3;
+        super(new RetroAnimation('graphics/mr-croc-walk-right.png', 2, SCALE), 7);
+        this.isJumping = false;
+        this.addAnimation('WALK_RIGHT', new RetroAnimation('graphics/mr-croc-walk-right.png', 2, SCALE, 10));
+        this.addAnimation('WALK_LEFT', new RetroAnimation('graphics/mr-croc-walk-left.png', 2, SCALE, 10));
     }
 
     moveRight(timestamp, delta = 1)
diff --git a/js/geometry/GeometryRect.js b/js/geometry/GeometryRect.js
index b987f23..65de13a 100644
--- a/js/geometry/GeometryRect.js
+++ b/js/geometry/GeometryRect.js
@@ -1,7 +1,6 @@
 import GeometryPoint from "./GeometryPoint.js";
 import GeometryStroke from "./GeometryStroke.js";
 import GeometryPointCollection from "./GeometryPointCollection.js";
-import GeometryLine from "./GeometryLine.js";
 
 export default class GeometryRect
 {
@@ -26,12 +25,17 @@ export default class GeometryRect
      */
     isContainingPoint(geometryPoint)
     {
-        let containsHorizontally = geometryPoint.x >= this.position.x && geometryPoint.x <= this.position.x + this.width;
-        let containsVertically = geometryPoint.y >= this.position.y && geometryPoint.y <= this.position.y + this.height;
+        let containsHorizontally = geometryPoint.x >= this.position.x && geometryPoint.x < this.position.x + this.width;
+        let containsVertically = geometryPoint.y >= this.position.y && geometryPoint.y < this.position.y + this.height;
 
         return containsHorizontally && containsVertically;
     }
 
+    isEqual(rect)
+    {
+        return rect.x === this.x && rect.y === this.y && rect.width === this.width && rect.height === this.height;
+    }
+
     hasIntersectionWithRect(rect)
     {
         return this.getBorderIntersectonsWithRect(rect).getLength() > 0;
@@ -170,8 +174,8 @@ export default class GeometryRect
 
         collection.addGeometryPoint(this.position);
         collection.addGeometryPoint(new GeometryPoint(this.position.x + this.width, this.position.y));
-        collection.addGeometryPoint(new GeometryPoint(this.position.x, this.position.y + this.height));
-        collection.addGeometryPoint(new GeometryPoint(this.position.x + this.width, this.position.y + this.height));
+        collection.addGeometryPoint(new GeometryPoint(this.position.x, this.position.y + this.height - 1));
+        collection.addGeometryPoint(new GeometryPoint(this.position.x + this.width, this.position.y + this.height - 1));
 
         return collection;
     }
diff --git a/js/geometry/GeometryRectCollection.js b/js/geometry/GeometryRectCollection.js
new file mode 100644
index 0000000..f6f4db0
--- /dev/null
+++ b/js/geometry/GeometryRectCollection.js
@@ -0,0 +1,133 @@
+export default class GeometryRectCollection
+{
+    constructor()
+    {
+        this.rects = [];
+    }
+
+    isContainingRect(rect)
+    {
+        for (let r = 0; r < this.rects.length; r++) {
+            if (rect.isEqual(this.rects[r])) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    getUniqueWidth()
+    {
+        if (this.getLength() === 0) {
+            return null;
+        } else if (this.getLength() === 1) {
+            return this.rects[0];
+        }
+
+        let widths = [this.rects[0].width];
+
+        for (let r = 0; r < this.getLength(); r++) {
+            if (widths.indexOf(this.rects[r].width) !== -1) {
+                return this.rects[r];
+            }
+
+            widths.push(rect.width);
+        }
+
+        return null;
+    }
+
+    getUniqueHeight()
+    {
+        if (this.getLength() === 0) {
+            return null;
+        } else if (this.getLength() === 1) {
+            return this.rects[0].height;
+        }
+
+        let heights = [this.rects[0].height];
+
+        for (let r = 0; r < this.getLength(); r++) {
+            if (heights.indexOf(rect.height) !== -1) {
+                return rect.height;
+            }
+
+            heights.push(rect.height);
+        }
+
+        return null;
+    }
+
+    addRect(rect)
+    {
+        if (!this.isContainingRect(rect)) {
+            this.rects.push(rect);
+        }
+    }
+
+    getLength()
+    {
+        return this.rects.length;
+    }
+
+    getEqualWidths()
+    {
+        if (this.getLength() === 0) {
+            return null;
+        }
+
+        let width = this.rects[0].width;
+
+        for (let r = 1; r < this.getLength(); r++) {
+            if (this.rects[r].width === width) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    hasEqualWidths()
+    {
+        if (this.getLength() === 0) {
+            return false;
+        }
+
+        let width = this.rects[0].width;
+
+        for (let r = 1; r < this.getLength(); r++) {
+            if (this.rects[r].width !== width) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    hasEqualHeights()
+    {
+        if (this.getLength() === 0) {
+            return false;
+        }
+
+        let height = this.rects[0].height;
+
+        for (let r = 1; r < this.getLength(); r++) {
+            if (this.rects[r].height !== height) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    forEach(callback)
+    {
+        this.rects.forEach(callback);
+    }
+
+    getRect(index)
+    {
+        return this.rects[index];
+    }
+}
\ No newline at end of file
diff --git a/js/module.js b/js/module.js
index 128d987..2b8295e 100644
--- a/js/module.js
+++ b/js/module.js
@@ -1,10 +1,8 @@
-import RetroSprite from "./retro/RetroSprite.js";
 import Key from "./Key.js";
 import MrCroc from "./MrCroc.js";
 import RetroArchitecture from "./retro/RetroArchitecture.js";
-
-const MEDIA_READY_EVENT = 'mediaready';
-const IMAGE_READY_EVENT = 'imgready';
+import FileLoader from "./FileLoader.js";
+import GeometryPoint from "./geometry/GeometryPoint.js";
 
 class ImageLoader
 {
@@ -52,12 +50,59 @@ function MainLoop(timestamp)
         mrCroc.moveRight(timestamp, delta);
     }
 
-    if (lastRendered >= FRAME_DURATION) {
-        context.clearRect(0, 0, window.innerWidth, window.innerHeight);
+    lastGroundHeight = Math.min(
+        architecture.getGroundHeight(mrCroc.getPositionFootLeft()),
+        architecture.getGroundHeight(mrCroc.getPositionFootRight())
+    );
 
-        ground.draw(context);
-        mrCroc.draw(context);
+    mrCroc.position.y += mrCroc.fallSpeed;
+
+    groundHeight = Math.min(
+        architecture.getGroundHeight(mrCroc.getPositionFootLeft()),
+        architecture.getGroundHeight(mrCroc.getPositionFootRight())
+    );
+
+    if (mrCroc.position.y < lastGroundHeight) {
+        mrCroc.fallSpeed += GRAVITY * delta;
+    }
+    /*
+
+    if (architecture.hasRectCollision(mrCroc.getRect())) {
+        mrCroc.position.x = lastPosition.x;
+    }
+    let archIntersections = architecture.getCollisionRects(mrCroc.getRect());
+
+    let width = archIntersections.getUniqueWidth();
+
+    if (width !== null) {
+        if (width.x === mrCroc.position.x) {
+            mrCroc.position.x += width.width;
+        } else {
+            mrCroc.position.x = width.x - mrCroc.getRect().width;
+        }
+    }
+
+    */
+
+    if (mrCroc.position.y !== lastGroundHeight) {
+        if (lastGroundHeight < groundHeight) {
+            mrCroc.position.y = lastGroundHeight;
+            mrCroc.fallSpeed = 0;
+        } else {
+            mrCroc.fallSpeed += GRAVITY * delta;
+        }
+    } else {
+        if (!mrCroc.isJumping && mrCroc.fallSpeed === 0 && KeyJump.isPressed()) {
+            mrCroc.jump();
+        } else if (!KeyJump.isPressed()) {
+            mrCroc.isJumping = false;
+        }
+    }
+
+    if (timestamp - lastRendered >= FRAME_DURATION) {
+        context.clearRect(0, 0, window.innerWidth, window.innerHeight);
         architecture.draw(context);
+        mrCroc.draw(context);
         lastRendered = timestamp;
     }
 
@@ -69,16 +114,23 @@ function MainLoop(timestamp)
 const FPS = 60;
 const FRAME_DURATION = 1000 / FPS;
 const GAME_SPEED = 1;
+const GRAVITY = 1;
 
-const LEVEL = '{"tileset": "graphics/tileset.png", "tiles": 1, "scale": 3, "rows": 9, "columns": 16, "matrix": [[0, null, null, null, null, null, null, null, null, null, null, null, null, null, null, 0], [null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, 0], [null, null, null, null, null, 0, 0, 0, 0, 0, null, null, null, null, null, 0], [null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, 0], [null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null], [0, 0, 0, 0, 0, null, null, null, null, null, null, null, null, null, null, null], [null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null], [null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null], [null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null]]}';
+let levelJson = new FileLoader('levels/test.json');
+const LEVEL = levelJson.getContent();
+
+console.log(LEVEL);
 
 let lastRendered = undefined;
 let lastTimestamp = undefined;
+let groundHeight = undefined;
+let lastGroundHeight = undefined;
 let context;
-let ground, mrCroc, architecture;
+let mrCroc, architecture;
 
 let KeyLeft = new Key('ArrowLeft');
 let KeyRight = new Key('ArrowRight');
+let KeyJump = new Key('Space');
 
 let loader = new ImageLoader();
 
@@ -99,15 +151,12 @@ imgBackground.src = 'graphics/ground.jpg';
 loader.addImage(imgBackground);
 
 let imgArch = new Image();
-imgArch.src = 'graphics/tileset.png';
+imgArch.src = 'graphics/maria-world.jpg';
 loader.addImage(imgArch);
 
 window.addEventListener(
     'imagesloaded',
     () => {
-        ground = new RetroSprite('graphics/ground.jpg', 4);
-        ground.position.y = window.innerHeight - ground.getRect().height;
-
         let canvas = document.getElementById('canvas');
         canvas.width = window.innerWidth;
         canvas.height = window.innerHeight;
@@ -117,9 +166,11 @@ window.addEventListener(
         architecture = RetroArchitecture.createFromJson(LEVEL);
 
         mrCroc = new MrCroc();
-        mrCroc.position.x = 100;
-        mrCroc.position.y = 480;
-        ground.draw(context);
+        mrCroc.position.x = 300;
+        mrCroc.position.y = 100;
+
+        architecture.draw(context);
+        mrCroc.draw(context);
 
         window.requestAnimationFrame(MainLoop);
     }
diff --git a/js/retro/RetroArchitecture.js b/js/retro/RetroArchitecture.js
index d8b9ffe..750531c 100644
--- a/js/retro/RetroArchitecture.js
+++ b/js/retro/RetroArchitecture.js
@@ -1,6 +1,6 @@
 import RetroSprite from "./RetroSprite.js";
-import GeometryRect from "../geometry/GeometryRect.js";
 import RetroArchitectureTile from "./RetroArchitectureTile.js";
+import GeometryRectCollection from "../geometry/GeometryRectCollection.js";
 
 export default class RetroArchitecture
 {
@@ -24,6 +24,29 @@ export default class RetroArchitecture
         }
     }
 
+    getCollisionRects(rect)
+    {
+        let posX = Math.floor(rect.position.x / this.tileWidth) - 2;
+        let posY = Math.floor(rect.position.y / this.tileHeight) - 2;
+        let rangeX = parseInt( posX + rect.width / this.tileWidth) + 4;
+        let rangeY = parseInt(posY + rect.height / this.tileHeight) + 4;
+
+        let collection = new GeometryRectCollection();
+
+        for (let y = Math.max(0, posY); y < rangeY; y++) {
+            for (let x = Math.max(0, posX); x < rangeX; x++) {
+                if (y < this.matrix.length && x < this.matrix[y].length && this.matrix[y][x] !== null) {
+                    let intersection = this.matrix[y][x].rect.getRectIntersection(rect);
+                    if (intersection !== null) {
+                        collection.addRect(intersection);
+                    }
+                }
+            }
+        }
+
+        return collection;
+    }
+
     hasRectCollision(rect)
     {
         let posX = Math.floor(rect.position.x / this.tileWidth) - 2;
diff --git a/js/retro/RetroSprite.js b/js/retro/RetroSprite.js
index 0553290..b21e3f6 100644
--- a/js/retro/RetroSprite.js
+++ b/js/retro/RetroSprite.js
@@ -46,6 +46,21 @@ export default class RetroSprite
         return this.canvas.height;
     }
 
+    getFootHeight()
+    {
+        return new GeometryPoint(this.position.x, this.position.y + this.getHeight());
+    }
+
+    getPositionLeftFoot()
+    {
+        return new GeometryPoint(this.position.x - this.getWidth() * 0.5, this.position.y);
+    }
+
+    getPositionRightFoot()
+    {
+        return new GeometryPoint(this.position.x + this.getWidth() * 0.5, this.position.y);
+    }
+
     draw(context)
     {
         context.drawImage(this.canvas, this.position.x, this.position.y);