drawline can't display game? give me a solution

 private const float TILE_SIZE = 1.0f;
 private const float TILE_OFFSET = 0.5f;

 private int selectionX = -1;
 private int selectionY = -1;

 private void Update(){
     PapanCatur ();
     UpdateSelection ();
 }

 private void UpdateSelection ()
 {
     if (!Camera.main)
         return;
     RaycastHit hit;
     if (Physics.Raycast (Camera.main.ScreenPointToRay (Input.mousePosition), out hit, 25.0f, LayerMask.GetMask ("ChekersPlane"))) {
         selectionX = (int)hit.point.x;
         selectionY = (int)hit.point.z;
     } else {
         selectionX = -1;
         selectionY = -1;
     }
 }

 private void PapanCatur(){
     
     Vector3 widthLine = Vector3.right * 8;
     Vector3 heightline = Vector3.forward * 8;
     for(int i = 0; i<=8; i++){
         //debug.drawline cant display in game unity
         Vector3 start = Vector3.forward * i;
         Debug.DrawLine (start, start + widthLine,Color.yellow,0.0f, true);
         for (int j = 0; j <= 8; j++) {
             start = Vector3.right * j;
             Debug.DrawLine (start, start + heightline,Color.yellow,0.0f,true);
         }
     }
     //draw the selection
     if (selectionX >= 0 && selectionY >= 0) {
         Debug.DrawLine (
             Vector3.forward * selectionY + Vector3.right * selectionX,
             Vector3.forward * (selectionY + 1) + Vector3.right * (selectionX + 1));
         
         Debug.DrawLine (
             Vector3.forward * (selectionY + 1 ) +Vector3.right * selectionX,
             Vector3.forward * selectionY + Vector3.right * (selectionX + 1));

     }
 }

}

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