diff --git a/sketch.js b/sketch.js
index 5351380..9be94e0 100644
--- a/sketch.js
+++ b/sketch.js
@@ -5,6 +5,7 @@ var processStop_timer;
 var fps_recent_values = [];
 var death_timer;
 var showDebugData = false;
+var debug_charTrace = [];
 
 var gameChar;
 
@@ -21,6 +22,45 @@ var platforms = [];
 var enemies = [];
 var flagpole;
 
+function Platform(curGroundIndex, x, width, y) {
+    this.curGroundIndex = curGroundIndex;
+    this.x = x;
+    this.width = width;
+    this.y = y || Math.pow(gameChar.baseJumpingStrength, 2) / 2 - 2 * gameChar.baseJumpingStrength;
+  
+    this.draw = function () {
+      push();
+      stroke(0);
+      strokeWeight(2);
+      fill(palette.ground_color0);
+      rect(
+        this.x - this.width,
+        floorPos_y - this.y,
+        width*2, height/100,
+      );
+
+      pop();
+    };
+  
+    this._isWithinX = function (who) {
+      if (who.x > this.x - this.width && who.x < this.x + this.width) {
+        return true;
+      }
+    };
+  
+    this.isBelow = function (who) {
+      if (this._isWithinX(who) && who.y > this.y) {
+        return true;
+      }
+    };
+  
+    this.isAbove = function (who) {
+      if (this._isWithinX(who) && who.y < this.y) {
+        return true;
+      }
+    };
+  }
+
 var text_size;
 // Variables to set colors. Set in setup()
 var palette;
@@ -401,14 +441,13 @@ function startGame(level_start) {
                     }
                 }
             }
+            for (i = 0; i < groundPositions.length; i++) {
+                platforms[i] = [];
+            }
             for (i = 0; i < 100; i++) {
                 if (i == 0) {
-                    platforms[0] = {
-                        curGroundIndex: 0,
-                        x: 700,
-                        width: 50,
-                        y: pow(gameChar.baseJumpingStrength, 2) / 2,
-                    }
+                    platforms[0][0] = new Platform(0, 700, 50, 
+                    pow(gameChar.baseJumpingStrength, 2) / 2 - 2*gameChar.baseJumpingStrength);
                 }
             }
         }
@@ -462,6 +501,8 @@ function draw() {
     // -------- FLAGPOLE ------------
     renderFlagpole();
     if (!flagpole.isReached) checkFlagpole();
+    // -------- PLATFORMS
+    drawPlatforms();
 
     // -------- GAME CHARACTER ------
     {
@@ -511,12 +552,28 @@ function draw() {
         text("Level complete. Press space to continue...", 0, height / 2);
     if (showDebugData) {
         text(gameChar.curGroundIndex, 99, 99);
-        text(gameChar.getCurGroundPosY(), 188, 99);
+        text(gameChar.getCurGroundY(), 188, 99);
         text(gameChar.sprite, 277, 99);
+
+        // draw game character's trajectory
+        drawCharTrace();
         drawFps();
     }
     pop();
 }
+function drawCharTrace() {
+    debug_charTrace.push([gameChar.x, gameChar.y]);
+        if (debug_charTrace.length>100) debug_charTrace.shift();
+        push()
+            stroke(255,0,0);
+            strokeWeight(3);
+            translate(-cameraPosX, 0);
+        for (i=0;i<debug_charTrace.length;i++) {
+            point(debug_charTrace[i][0], debug_charTrace[i][1]);
+        }              
+        translate(cameraPosX, 0);
+        pop();
+}
 function checkRiver(t_river) {
     if (
         gameChar.x > river.x - river.width / 2 &&
@@ -610,7 +667,6 @@ function drawRiver(t_river) {
 }
 function drawCollectable(t_collectable) {
     push();
-    // centering coins a bit upper
     // animating the coin's jiggle
     // a - vert. intensity, c - hor. intensity, b - vert. speed, d - hor. speed
     a = 0.1;
@@ -786,6 +842,15 @@ function drawTrees() {
         }
     }
 }
+
+function drawPlatforms() {
+    for (i=0; i<groundPositions.length; i++) {
+        for (k=0; k<platforms[i].length;k++) {
+            platforms[i][k].draw();
+        }
+    }
+}
+
 function renderFlagpole() {
     // NB - This function is implemented a bit differently than how it was requested in Part 6.
     // It has no states to switch between - instead, the flag gradually goes into the opposite direction