diff --git a/src/_cat.js b/src/_cat.js
new file mode 100644
index 0000000..34f2e66
--- /dev/null
+++ b/src/_cat.js
@@ -0,0 +1,159 @@
+export class Cat {
+  constructor(x, y, targetSize) {
+    this.x = x;
+    this.y = y;
+    this.size = 171;
+    this.targetSize = targetSize;
+    this.sprite = null;
+    this.loaded = false;
+    this.velocity = 24;
+    this.count = 0;
+
+    loadImage('assets/cat.webp', (img) => {
+      this.sprite = new Sprite(this.x, this.y, this.size, this.size);
+      this.sprite.spriteSheet = img;
+      this.sprite.anis.offset.y = 3;
+      this.sprite.anis.frameDelay = 8;
+      this.sprite.friction = 0;
+      this.sprite.addAnis({
+        jump: { row: 0, frames: 4 },
+        death: { row: 1, frames: 4 },
+        hurt: { row: 2, frames: 2 },
+        idle: { row: 3, frames: 4 },
+        walk: { row: 4, frames: 6 }
+      });
+      this.sprite.changeAni('idle');
+
+      const scaleFactor = this.targetSize / 171;
+      this.sprite.scale = scaleFactor;
+      this.loaded = true;
+    });
+  }
+  
+  update() {
+    if (!this.sprite) return;
+    console.log(`updating sprite...`);
+
+    this.sprite.position.x = this.x;
+    this.sprite.position.y = this.y;
+
+    if (kb.pressing('left')) {
+      console.log("accepting pressed kb");
+      this.sprite.vel.x = -1;
+    } else if (kb.pressing('right')) {
+      this.sprite.vel.x = 1;
+    } else {
+      this.sprite.vel.x = 0;  // Stop the hero if no keys are pressed
+    }
+  };
+
+  draw() {
+    if (!this.sprite) return;
+    // this.sprite.draw();
+    this.sprite.update();
+  };
+
+  changeAni(key) {
+    if (!this.sprite) return;
+
+    switch (key) {
+      case 'w':
+        this.sprite.changeAni("walk");
+        break;
+      case 'j':
+        this.sprite.changeAni("jump");
+        break;
+      case 'i':
+        this.sprite.changeAni("idle");
+        break;
+      case 'h':
+        this.sprite.changeAni("hurt");
+        break;
+      case 'd':
+        this.sprite.changeAni("death");
+        break;
+      default:
+        break;
+    };
+  };
+
+  setPosition(x, y) {
+    if (this.sprite) {
+      this.sprite.position.x = x;
+      this.sprite.position.y = y;
+    };
+  };
+
+  keyPressed(key) {
+    if (key === 'ArrowRight') {
+      this.moveRight();
+    }
+  }
+  
+
+  remove() {
+    if (!this.sprite) return;
+
+    this.sprite.remove();
+    this.sprite = null;
+  }
+
+  /// i want to add this part to move sprite across the canvas when user presses right arrow
+  // if (kb.presses('right')) {
+  //   this.move(30, 'right', 3)
+  // }
+
+  move(direction){
+    if (!direction) return;
+    console.log(`entered move method`);
+    if (direction == "right") this.moveRight();
+    if (direction == "up") this.moveUp();
+  }
+
+  moveRight(){
+    console.log(`${this.count}`);
+    this.changeAni('w')
+    this.sprite.vel.x = 1;
+    this.count += 1;
+  }
+
+  moveUp(){
+    console.log(`sprite should move up...`);
+    this.changeAni('j')
+  }
+
+  runCat(steps){
+    steps.forEach(element => {
+      setTimeout(() => {
+        console.log(element)
+      }, 1000);
+    });
+  }
+
+
+  // helper
+  _getSpritePosition(){
+    console.log(`sprite's actual position: ${this.sprite.x}, ${this.sprite.y}`);
+    return (this.sprite.x, this.sprite.y);
+  }
+
+  _translate(step){
+    switch (step) {
+      case 'up':
+        console.log('move: up');
+        return 'jump'
+        break;
+      case 'right':
+        console.log('move: down');
+        return 'walk'
+        break;
+      case 'down':
+        console.log('move: up');
+        return 'jump'
+        break;
+      default:
+        break;
+    }
+  }
+}
+  
\ No newline at end of file
diff --git a/src/cat.js b/src/cat.js
index 9f4b390..569cd72 100644
--- a/src/cat.js
+++ b/src/cat.js
@@ -8,6 +8,15 @@ export class Cat {
     this.loaded = false;
     this.velocity = 24;
 
+    this.steps = [];
+
+    this.currentStepIndex = 0;
+    this.isMoving = false;
+    this.stepTimer = 0;
+    this.stepDuration = 40; // frames to complete one movement
+    this.moveDirection = null;
+
+
     loadImage('assets/cat.webp', (img) => {
       this.sprite = new Sprite(this.x, this.y, this.size, this.size);
       this.sprite.spriteSheet = img;
@@ -30,20 +39,87 @@ export class Cat {
   }
   
   update() {
-    if (this.sprite) {
-      this.sprite.position.x = this.x;
-      this.sprite.position.y = this.y;
+    // if (!this.sprite) return;
+    if (!this.sprite || this.steps.length === 0) return;
+    console.log(`updating sprite...`);
+
+    if (this.isMoving) {
+      this._continueMovement();
+    } else if (this.currentStepIndex < this.steps.length) {
+      this._startMovement(this.steps[this.currentStepIndex]);
     }
+
+    this.sprite.position.x = this.x;
+    this.sprite.position.y = this.y;
+
+    // console.log(`steps to run: ${this.steps}`);
+
+    this._handleInput();
+    
   };
 
+  update() {
+    if (!this.sprite || this.steps.length === 0) return;
+  
+    if (this.isMoving) {
+      this._continueMovement();
+    } else if (this.currentStepIndex < this.steps.length) {
+      this._startMovement(this.steps[this.currentStepIndex]);
+    }
+  
+    this.sprite.position.x = this.x;
+    this.sprite.position.y = this.y;
+  }
+  
+
+  run(steps) {
+    this.steps = steps.map(e => e.direction);
+    this.currentStepIndex = 0;
+    this.isMoving = false;
+  }
+
+  _startMovement(direction) {
+    this.moveDirection = direction;
+    this.stepTimer = 0;
+    this.isMoving = true;
+  
+    if (direction === 'right') {
+      this.changeAni('w');
+    } else if (direction === 'up' || direction === 'down') {
+      this.changeAni('j');
+    }
+  }
+
+  _continueMovement() {
+    this.stepTimer++;
+  
+    const delta = this.velocity / this.stepDuration;
+  
+    if (this.moveDirection === 'right') this.x += delta;
+    if (this.moveDirection === 'up') this.y -= delta;
+    if (this.moveDirection === 'down') this.y += delta;
+  
+    if (this.stepTimer >= this.stepDuration) {
+      this.isMoving = false;
+      this.currentStepIndex++;
+      this.changeAni('i'); // back to idle after each move
+    }
+  }
+  
+
+  keyPressed(key) {
+    console.log(`receiving keyboard input: ${key}`);
+  }
+
   draw() {
-    if (this.sprite) this.sprite.draw();
+    if (!this.sprite) return;
+    this.update();
+    this.sprite.update();
   };
 
   changeAni(key) {
     if (!this.sprite) return;
-    console.log('changing animation...');
-    console.log(key);
+
     switch (key) {
       case 'w':
         this.sprite.changeAni("walk");
@@ -72,37 +148,44 @@ export class Cat {
     };
   };
 
-  moveRight() {
-    if (this.x + this.targetSize >= width) {
-      this.x = width - this.targetSize; // Ensure it doesn't go beyond the boundary
-      this.setPosition(this.x, this.y);
-      this.changeAni('i'); // Optionally change to idle if boundary reached
-      return;
-    }
-    this.x += this.velocity;  // Keep moving
-    this.setPosition(this.x, this.y);
-    console.log(`sprite's actual position: ${this._getSpritePosition()}`)
-    this.changeAni('w'); // Keep walking animation
-  }
-
-  keyPressed(key) {
-    if (key === 'ArrowRight') {
-      this.moveRight();
-    }
-  }
-  
-
   remove() {
     if (!this.sprite) return;
-
     this.sprite.remove();
     this.sprite = null;
   }
 
+  moveUp(){
+    console.log(`sprite should move up...`);
+    this.changeAni('j')
+  }
+
   // helper
   _getSpritePosition(){
     console.log(`sprite's actual position: ${this.sprite.x}, ${this.sprite.y}`);
     return (this.sprite.x, this.sprite.y);
   }
+
+  _translate(step){
+    switch (step) {
+      case 'up':
+        console.log('move: up');
+        return 'jump'
+        break;
+      case 'right':
+        console.log('move: down');
+        return 'walk'
+        break;
+      case 'down':
+        console.log('move: up');
+        return 'jump'
+        break;
+      default:
+        break;
+    }
+  }
+
+  _handleInput(){
+    console.log('assume i have something....');
+  }
 }
   
\ No newline at end of file
diff --git a/src/components/ClickableArrow.js b/src/components/ClickableArrow.js
index 9289775..2211fb8 100644
--- a/src/components/ClickableArrow.js
+++ b/src/components/ClickableArrow.js
@@ -1,47 +1,72 @@
+import { colors } from "../utils/theme";
+
 export class ClickableArrow {
-    static images = {};
+  static images = {};
   
-    static preload() {
-      ClickableArrow.images.up = loadImage('/assets/up.png');
-      ClickableArrow.images.down = loadImage('/assets/down.png');
-      ClickableArrow.images.left = loadImage('/assets/left.png');
-      ClickableArrow.images.right = loadImage('/assets/right.png');
-      ClickableArrow.images.empty = loadImage('/assets/empty.png');
-    }
-  
-    constructor(direction, clickable=false) {
-      this.direction = direction;
-      this.image = ClickableArrow.images[direction];
-      this.clickable = clickable;
-      // this.onClick = onClick | null;
-      this.x = 0;
-      this.y = 0;
-      this.width = 40;
-      this.height = 40;
-    }
-  
-    draw(x, y) {
-      this.x = x;
-      this.y = y;
-      stroke(255);
-      image(this.image, x, y, 40, 40);
-    }
-
-    handleClick(mouseX, mouseY) {
-      if (this._isMouseOver(mouseX, mouseY) && this._onClick) {
-        this._onClick();
-      }
-    }
-
-    //helpers
-    _onClick(){
-      console.log('clicked!');
-    }
-
-    _isMouseOver(mouseX, mouseY) {
-      return mouseX > this.x && mouseX < this.x + this.width &&
-             mouseY > this.y && mouseY < this.y + this.height;
-    }
-
+  static preload() {
+    ClickableArrow.images.up = loadImage('/assets/up.png');
+    ClickableArrow.images.down = loadImage('/assets/down.png');
+    ClickableArrow.images.left = loadImage('/assets/left.png');
+    ClickableArrow.images.right = loadImage('/assets/right.png');
+    ClickableArrow.images.empty = loadImage('/assets/empty.png');
   }
+
+  constructor(direction, clickable = false) {
+    console.log(`constructing a new clickable arrow....`);
+    this.direction = direction;
+    this.image = ClickableArrow.images[direction];
+    this.clickable = clickable;
+    this.selected = false;
+    this.x = 0;
+    this.y = 0;
+    this.width = 40;
+    this.height = 40;
+  }
+
+  draw(x, y) {
+    this.x = x;
+    this.y = y;
+    stroke(255);
+    fill(200);
+
+    if (this.selected) {
+      fill(colors.tertiary);
+    } else {
+      fill(255);
+    }
+    rect(x, y, 40, 40);
+    image(this.image, x, y, 40, 40);
+  }
+
+  handleClick(mouseX, mouseY) {
+    if (this._isMouseOver(mouseX, mouseY) && this._onClick) {
+      this._onClick();
+    }
+  }
+
+  set(direction){
+    this.direction = direction;
+    this.image = ClickableArrow.images[direction];
+  }
+
+  select(){
+    this.selected = true;
+  }
+
+  unselect(){
+    this.selected = false;
+  }
+
+  //helpers
+  _onClick(){
+    if (!this.clickable) return;
+    console.log('clicked!');
+  }
+
+  _isMouseOver(mouseX, mouseY) {
+    return mouseX > this.x && mouseX < this.x + this.width &&
+            mouseY > this.y && mouseY < this.y + this.height;
+  }
+
+}
   
\ No newline at end of file
diff --git a/src/components/ControlPanel.js b/src/components/ControlPanel.js
index 69b51ac..f5f1bbc 100644
--- a/src/components/ControlPanel.js
+++ b/src/components/ControlPanel.js
@@ -11,15 +11,14 @@ export class ControlPanel {
         this.boxWidth = 48;
         this.boxHeight = 48;
         this.boxSpacing = 8;
-        this.contents = Array(numBoxes).fill(null);
-        this.empty = new Arrow('empty');
+        this.contents = Array(numBoxes).fill(null).map(() => new ClickableArrow('empty', true));
+        this.empty = new ClickableArrow('empty', true);
         this.fontSize = 20;
         this.gap = this.fontSize;
     }
 
     setContents(contents){
         this.contents = contents;
-        console.log(this.contents);
     }
 
     updateBox(index, content) {
diff --git a/src/main.js b/src/main.js
index 9b5d8ce..f8ef094 100644
--- a/src/main.js
+++ b/src/main.js
@@ -8,6 +8,7 @@ let mgr;
 
 function setup(){
     createCanvas(windowWidth, windowHeight);
+    console.log(`window size: ${windowWidth}x${windowHeight}`);
     textFont('Pixelify Sans', 'sans-serif');
     textAlign(CENTER);
     textSize(128);
@@ -21,6 +22,9 @@ function setup(){
 function draw(){
     background(colors.primary);
     mgr.draw();
+
+    // custom event handler, manually called
+    // mgr.handleEvent('keyPressing');
 };
 
 function windowResized() {
@@ -28,10 +32,8 @@ function windowResized() {
   mgr.handleEvent('onResize');
 };
 
-
 function mousePressed(){
     mgr.handleEvent('mousePressed');
-    gameScene.handleClick(mouseX, mouseY);
 };
 
 function preload(){
@@ -43,9 +45,10 @@ function keyPressed(){
     mgr.handleEvent('keyPressed');
 }
 
+
 window.setup = setup;
 window.draw = draw;
-// window.windowResized = windowResized;
 window.mousePressed = mousePressed;
 window.preload = preload;
-window.keyPressed = keyPressed;
\ No newline at end of file
+window.keyPressed = keyPressed;
+
diff --git a/src/scenes/gameScene.js b/src/scenes/gameScene.js
index 6a2db9f..25dbe10 100644
--- a/src/scenes/gameScene.js
+++ b/src/scenes/gameScene.js
@@ -8,6 +8,11 @@ import { ControlPanel } from '../components/controlPanel.js';
 
 
 export default function GameScene() {
+  const groundHeight = 100;
+  const worldHeight = windowHeight - groundHeight;
+  const catSize = 150;
+  const worldBlockSize = 100;
+
   let cat;
   let runButton;
   let blocks;
@@ -15,6 +20,22 @@ export default function GameScene() {
   let loops;
   let clickArrow;
 
+  let clicked;
+
+  let selectedStepIndex = null;
+  
+  const buildingBlocks = [
+    new ClickableArrow('up', false),
+    new ClickableArrow('right', false),
+  ];
+  
+  // changed on user input
+  let selectedSteps;
+  let selectedBlock;
+
+  // selectedSteps = ['up', 'right', 'up', 'up', 'right', 'down'];
+  // selectedSteps = selectedSteps.map((e) => new ClickableArrow(e, true));
+
   const slots = {
     blocks: 2,
     steps: 6,
@@ -24,10 +45,7 @@ export default function GameScene() {
   this.name = "GameScene";
 
   this.setup = () => {
-    cat = new Cat(width / 6, height - 167.5, 150);
-
-    // test
-    clickArrow = new ClickableArrow('up', true);
+    cat = new Cat(width / 4, height - 175 - 2, catSize);
 
     runButton = new MyButton({
       x: width / 32 * 28.5,
@@ -35,9 +53,7 @@ export default function GameScene() {
       text: "run >>",
       mode: "CORNER",
       style: buttonS,
-      onPress: () => {
-        console.log("Run button pressed");
-      }
+      onPress: () => cat.run(steps.contents),
     });
 
     blocks = new ControlPanel({
@@ -46,6 +62,7 @@ export default function GameScene() {
       y: height / 32,
       numBoxes: 2
     });
+    blocks.setContents(buildingBlocks);
 
     steps = new ControlPanel({
       name: 'steps',
@@ -53,21 +70,14 @@ export default function GameScene() {
       y: height / 32,
       numBoxes: 6
     });
+    
 
-    loops = new ControlPanel({
-      name: 'loop',
-      x: width / 32 * 7 + 48 * (slots.blocks + slots.steps + 2.75),
-      y: height / 32,
-      numBoxes: 4
-    });
-
-    blocks.setContents([
-      new Arrow('right'),
-      // new Arrow('up')
-      new ClickableArrow('up', true),
-    ]);
-
-
+    // loops = new ControlPanel({
+    //   name: 'loop',
+    //   x: width / 32 * 7 + 48 * (slots.blocks + slots.steps + 2.75),
+    //   y: height / 32,
+    //   numBoxes: 4
+    // });
   };
 
   this.draw = () => {
@@ -78,22 +88,38 @@ export default function GameScene() {
     stroke(colors.secondary);
     strokeWeight(7);
     textAlign(LEFT, TOP);
-    text('lvl.3', width / 32, height /32 - 4);
+    text('lvl.1', width / 32, height /32 - 4);
 
     // Ground
-    rectMode(CENTER);
+    rectMode(CORNER);
     fill(colors.secondary);
-    rect(width / 2, height - 100 / 2, width, 80);
+    rect(0, height - groundHeight, width, groundHeight);
+
+    console.log(`ground is drawn at (0, ${height - groundHeight}) with size of ${width}x${groundHeight}`)
+
+    // Obstacle
+    console.log(`world size: ${windowWidth}, ${windowHeight}`);
+    for (let y = windowHeight - groundHeight - 2; y > 0; y -= worldBlockSize) {
+      for (let x = 0; x < width ; x += worldBlockSize) {
+        stroke(0)
+        strokeWeight(1)
+        noFill()
+        rect(x, y, worldBlockSize, worldBlockSize);
+        textSize(24);
+        const x_cnt = Math.floor(x / worldBlockSize);
+        const y_cnt = Math.floor(y / worldBlockSize);
+        const txt = `${x_cnt}, ${y_cnt}`;
+        text(txt, x + 8, y + 8);
+      }
+    }
 
     runButton.draw();
     blocks.draw();
     steps.draw();
-    loops.draw();
+    // loops.draw();
     
     // Sprite
-    camera.on();
     cat.draw();
-    camera.off();
   };
 
   this.onResize = () => {
@@ -104,20 +130,45 @@ export default function GameScene() {
   }
 
   this.keyPressed = () => {
+    console.log(`key: ${key}, keyCode: ${keyCode}`);
+
     const _key = key;
     console.log(`key passed: ${_key}`);
-    if (_key == "ArrowRight") {
-      cat.keyPressed(_key);
+
+    if (keyCode === ESCAPE) {
+        // Deselect the currently selected arrow if any
+        if (selectedStepIndex !== null && steps.contents[selectedStepIndex]) {
+            steps.contents[selectedStepIndex].selected = false;
+        }
+        selectedStepIndex = null;
     } else {
-      cat.changeAni(_key);
+        cat.keyPressed(key);
     }
   }
 
-  this.handleClick = function(mx, my) {
-    this.arrows.forEach(arrow => {
-      if (arrow.clickable) {
-        arrow.handleClick(mx, my);
+  this.mousePressed = function() {
+    console.log(`canvas clicked at ${mouseX}, ${mouseY}`);
+
+    steps.contents.forEach((arrow, index) => {
+      if (arrow._isMouseOver(mouseX, mouseY)) {
+        selectedStepIndex = index;
+        steps.contents.forEach(a => a.selected = false);
+        arrow.select();
       }
     });
-  }
+
+    blocks.contents.forEach((arrow) => {
+      if (arrow._isMouseOver(mouseX, mouseY)) {
+        // console.log("Clicked arrow", arrow.direction);
+        if (selectedStepIndex !== null) {
+          const selectedArrow = steps.contents[selectedStepIndex];
+          selectedArrow.set(arrow.direction);
+          selectedArrow.clickable = true;
+          selectedArrow.selected = false;
+          selectedStepIndex = null;
+        }
+      }
+    });
+
+  };  
 }
diff --git a/src/scenes/startScene.js b/src/scenes/startScene.js
index 63a6e4d..d0f826e 100644
--- a/src/scenes/startScene.js
+++ b/src/scenes/startScene.js
@@ -1,5 +1,5 @@
 import { colors } from '../utils/theme.js';
-import { Cat } from '../cat.js';
+import { Cat } from '../_cat.js';
 import { buttonL } from '../utils/theme.js';
 import GameScene from './gameScene.js';
 
diff --git a/src/style.css b/src/style.css
index 498990a..a4855c1 100644
--- a/src/style.css
+++ b/src/style.css
@@ -6,9 +6,9 @@ body {
 }
 
 body {
-  color: #333;
-  margin: 0;
-  padding: 8px;
+  /* color: #333;
+  margin: 0; */
+  /* padding: 8px; */
   box-sizing: border-box;
   /* font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
     Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif; */
diff --git a/src/utils/world_1.js b/src/utils/world_1.js
new file mode 100644
index 0000000..e69de29