Code for drawing map on GB

#include <Backlight.h>
#include <Battery.h>
#include <Buttons.h>
#include <Display.h>
#include <Gamebuino.h>
#include <Sound.h>
#include <SPI.h>

Gamebuino gb;

const PROGMEM byte Empty[] = //ID: 0
{
  8,8,
  B00000000,
  B00000000,
  B00000000,
  B00000000,
  B00000000,
  B00000000,
  B00000000,
  B00000000,
};

const PROGMEM byte Brick[] = //ID: 1
{
  8,8,
  B11111111,
  B00100001,
  B11111111,
  B10001000,
  B11111111,
  B00100001,
  B11111111,
  B10001000,
};

const PROGMEM byte SharpBrick[]= //ID: 2
{
  8,8,
  B11111111,
  B11000011,
  B10100101,
  B10011001,
  B10011001,
  B10100101,
  B11000011,
  B11111111,
};
const PROGMEM byte TowerBrick[]= //ID: 3
{
  8,8,
  B10101101,
  B10110101,
  B10101101,
  B10110101,
  B10101101,
  B10110101,
  B10101101,
  B10110101,
};

const PROGMEM byte Piston[]= //ID: 4
{
  8,8,
  B00000000,
  B01111110,
  B00100100,
  B00100100,
  B01000010,
  B00011000,
  B01111110,
  B00000000,
};

const PROGMEM byte Holder[]= //ID: 5
{
  8,8,
  B11111111,
  B10100101,
  B11111111,
  B00000000,
  B00000000,
  B00000000,
  B00000000,
  B00000000,
};

const PROGMEM byte  Teleporter1[]= //ID: 6
{
  8,8,
  B11111111,
  B10101011,
  B11010110,
  B10101100,
  B10101100,
  B11010110,
  B10101011,
  B11111111,
};

const PROGMEM byte Teleporter0[]= //ID: 7
{
  8,8,
  B11111111,
  B11010101,
  B01101011,
  B00110101,
  B00110101,
  B01101011,
  B11010101,
  B11111111,
};

const PROGMEM byte Wall[]= //ID: 8
{
  8,8,
  B11110000,
  B10010000,
  B10010000,
  B10010000,
  B10010000,
  B10010000,
  B10010000,
  B11110000,
};

const PROGMEM byte Ennemie[]= //ID: 8
{
  8,8,
  B11111111,
  B10000001,
  B10010011,
  B10010011,
  B10000001,
  B10000001,
  B10000001,
  B11111111,
};

const byte Map[] PROGMEM = {13,9,
8,8,

0,0,0,0,0,0,0,0,0,0,0,0,2,
2,1,2,5,5,8,0,0,0,0,0,0,7,
3,0,0,0,0,8,0,0,0,0,0,0,2,
3,0,0,0,0,0,4,5,2,0,0,0,3,
2,0,2,0,0,0,0,0,0,0,0,0,3,
3,0,3,0,0,0,0,0,0,0,0,0,3,
3,0,3,0,0,0,2,5,5,0,5,5,2,
3,0,3,0,9,0,3,0,9,0,0,0,7,
2,0,2,1,1,1,2,1,1,1,1,1,2,
};

const byte* sprites[10] = {
  Empty,
  Brick,
  SharpBrick,
  TowerBrick,
  Piston,
  Holder,
  Teleporter0,
  Teleporter1,
  Wall,
  Ennemie
};

byte getTile(byte x, byte y){
  /*if(x & 1)//odd
    return pgm_read_byte(Map + y*(13) + x/2) & B00001111;
  else //even
    return (pgm_read_byte(Map + y*(9) + x/2) >> 4);*/
    return pgm_read_byte(Map + (x+y*13));
}

int CPosX = 0;
int CPosY = 0;

void setup() {
  // put your setup code here, to run once:
  gb.begin();
  gb.titleScreen(F("BIGBLACKBOX Testing"));
}

void loop() {
  // put your main code here, to run repeatedly:
  if(gb.update()) {
      if(gb.buttons.pressed(BTN_UP))
        CPosY++;
      if(gb.buttons.pressed(BTN_DOWN))
        CPosY--;
      if(gb.buttons.pressed(BTN_RIGHT))
        CPosX--;
      if(gb.buttons.pressed(BTN_LEFT))
        CPosX++;

      for(byte x = 0; x < 13; x++) {
        for(byte y = 0; y < 9; y++) {
          byte Id;
          Id = getTile(x,y);
          gb.display.drawBitmap(CPosX + x*8, CPosY + y*8, sprites[Id]);
        }
      }
  }
}