Published November 9, 2025
Mini TETRIS (GAMBOY)

HI my name is Piyush Garg and I am 11 years old. This is my creation above. it took me about 3 weeks to complete it and I am very proud of it
BeginnerShowcase (no instructions)110
Things used in this project

Hardware components

SparkFun Arduino Pro Mini 328 - 5V/16MHz
Adafruit Monochrome 1.3" 128x64 OLED graphic display
Software apps and online services

Arduino IDE
Hand tools and fabrication machines

Soldering iron (generic)
Hot glue gun (generic)
Story

my project is about a gameboy I made. I made it because I get bored a lot sometimes and I don't know what to do, so I made this.IF YOU WANT TO SEE THIS WORK, GO TO THIS LINK:
https://youtu.be/vYH_v9lV9AM
Code

TETRIS
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define WIDTH 64 // OLED display width, in pixels
#define HEIGHT 128 // OLED display height, in pixels

Adafruit_SSD1306 display(128, 64, &Wire, -1);


const unsigned char epd_bitmap_download_1 [] PROGMEM = {
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 
  0x00, 0x00, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 
  0x00, 0x00, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x30, 0x1c, 0x06, 0x00, 0x00, 
  0x00, 0x00, 0xe0, 0x30, 0x1c, 0x06, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x30, 0x1c, 0x06, 0x00, 0x00, 
  0x00, 0x00, 0xe0, 0x30, 0x1c, 0x06, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x30, 0x1c, 0x06, 0x00, 0x00, 
  0x00, 0x00, 0xe0, 0x30, 0x1c, 0x06, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x30, 0x1c, 0x06, 0x00, 0x00, 
  0x00, 0x00, 0xe0, 0x30, 0x1c, 0x06, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x30, 0x1c, 0x06, 0x00, 0x00, 
  0x00, 0x00, 0xe0, 0x30, 0x1c, 0x06, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x30, 0x1c, 0x06, 0x00, 0x00, 
  0x00, 0x00, 0xe0, 0x30, 0x1c, 0x06, 0x00, 0x00, 0x00, 0x00, 0xe0, 0x30, 0x1c, 0x06, 0x00, 0x00, 
  0x00, 0x00, 0xe0, 0x30, 0x1c, 0x06, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 
  0x00, 0x00, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 
  0x00, 0x00, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xff, 0xff, 0xfe, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x30, 0x1c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x1c, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x30, 0x1c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x1c, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x30, 0x1c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x1c, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x30, 0x1c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x1c, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x30, 0x1c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x1c, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x30, 0x1c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x1c, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x30, 0x1c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x1c, 0x00, 0x00, 0x00, 
  0x01, 0xff, 0xe0, 0x3f, 0xfc, 0x07, 0xff, 0x80, 0x01, 0xff, 0xe0, 0x3f, 0xfc, 0x07, 0xff, 0x80, 
  0x01, 0xff, 0xe0, 0x3f, 0xfc, 0x07, 0xff, 0x80, 0x01, 0xff, 0xe0, 0x3f, 0xfc, 0x07, 0xff, 0x80, 
  0x01, 0xd2, 0xe0, 0x24, 0xd8, 0x07, 0xb7, 0x80, 0x01, 0x80, 0xe0, 0x00, 0x00, 0x06, 0x03, 0x80, 
  0x01, 0x80, 0xe0, 0x00, 0x00, 0x06, 0x03, 0x80, 0x01, 0x80, 0xe0, 0x00, 0x00, 0x06, 0x03, 0x80, 
  0x01, 0x80, 0xe0, 0x00, 0x00, 0x06, 0x03, 0x80, 0x01, 0x80, 0xe0, 0x00, 0x00, 0x06, 0x03, 0x80, 
  0x01, 0x80, 0xe0, 0x00, 0x00, 0x06, 0x03, 0x80, 0x01, 0x80, 0xe0, 0x00, 0x00, 0x06, 0x03, 0x80, 
  0x01, 0x80, 0xe0, 0x00, 0x00, 0x06, 0x03, 0x80, 0x01, 0x80, 0xe0, 0x00, 0x00, 0x06, 0x03, 0x80, 
  0x01, 0x80, 0xe0, 0x00, 0x00, 0x06, 0x03, 0x80, 0x01, 0x80, 0xe0, 0x00, 0x00, 0x06, 0x03, 0x80, 
  0x01, 0x80, 0xe0, 0x00, 0x00, 0x06, 0x03, 0x80, 0x01, 0x80, 0xe0, 0x00, 0x00, 0x06, 0x03, 0x80, 
  0x01, 0x80, 0xe0, 0x00, 0x00, 0x06, 0x03, 0x80, 0x01, 0xff, 0xff, 0xf0, 0x1f, 0xff, 0xff, 0x80, 
  0x01, 0xff, 0xff, 0xf0, 0x1f, 0xff, 0xff, 0x80, 0x01, 0xff, 0xff, 0xf0, 0x1f, 0xff, 0xff, 0x80, 
  0x01, 0xff, 0xff, 0xf0, 0x1f, 0xff, 0xff, 0x80, 0x01, 0xc0, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 
  0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 
  0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 
  0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 
  0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 
  0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 
  0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 
  0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 0x01, 0xc0, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 
  0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 
  0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 
  0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 
  0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 
  0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 
  0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 
  0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 
  0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 
  0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 0x01, 0x80, 0xe0, 0x30, 0x1c, 0x06, 0x03, 0x80, 
  0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 
  0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 
  0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};



// Array of all bitmaps for convenience. (Total bytes used to store images in PROGMEM = 1040)
const int epd_bitmap_allArray_LEN = 1;
const unsigned char* epd_bitmap_allArray[1] = {
  epd_bitmap_download_1
};


const char pieces_S_l[2][2][4] = {{
                                    {0, 0, 1, 1}, {0, 1, 1, 2}
                                   },
                                   {
                                    {0, 1, 1, 2}, {1, 1, 0, 0}
                                   }};
const char pieces_S_r[2][2][4]{{
                                  {1, 1, 0, 0}, {0, 1, 1, 2}
                                 },
                                 {
                                  {0, 1, 1, 2}, {0, 0, 1, 1}
                                 }};
                                 
const char pieces_L_l[4][2][4] = {{
                                  {0, 0, 0, 1}, {0, 1, 2, 2}
                                 },
                                 {
                                  {0, 1, 2, 2}, {1, 1, 1, 0}
                                 },
                                 {
                                  {0, 1, 1, 1}, {0, 0, 1, 2}
                                 },
                                 {
                                  {0, 0, 1, 2}, {1, 0, 0, 0}
                                 }};
const char pieces_Sq[1][2][4] = {{
                                  {0, 1, 0, 1}, {0, 0, 1, 1}
                                 }};
const char pieces_T[4][2][4] = {{
                                  {0, 0, 1, 0},{0, 1, 1, 2}
                                 },
                                 {
                                  {0, 1, 1, 2},{1, 0, 1, 1}
                                 },
                                 {
                                  {1, 0, 1, 1},{0, 1, 1, 2}
                                 },
                                 {
                                  {0, 1, 1, 2},{0, 0, 1, 0}
                                 }};
const char pieces_l[2][2][4] = {{
                                  {0, 1, 2, 3}, {0, 0, 0, 0}
                                 },
                                 {
                                  {0, 0, 0, 0}, {0, 1, 2, 3}
                                 }};

const short MARGIN_TOP = 19;
const short MARGIN_LEFT = 3;
const short SIZE = 5;
const short TYPES = 6;


word currentType, nextType, rotation;
short pieceX, pieceY;
short piece[2][4];

int interval = 500, score;
long timer, delayer;

boolean grid[10][18];
boolean b1, b2, b3;


void setup() {

  pinMode(5, INPUT_PULLUP);
  pinMode(9, INPUT_PULLUP);
  pinMode(15, INPUT_PULLUP);
  pinMode(10, INPUT_PULLUP);
  
  Serial.begin(9600);

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }

  display.setRotation(1);
  display.clearDisplay();

  display.drawBitmap(3, 23, epd_bitmap_download_1, 64, 82,  WHITE);
  display.display();
  delay(2500);
  display.clearDisplay();
  
  drawLayout();
  
  display.display();
      
  randomSeed(analogRead(0));
  nextType = random(TYPES);
  generate();
  
  timer = millis();
}

void loop() {

  if(millis() - timer > interval){
    checkLines();
    refresh();
    
    if(nextCollision()){
      for(short i = 0; i < 4; i++)
        grid[pieceX + piece[0][i]][pieceY + piece[1][i]] = 1;
      generate();
    }else
      pieceY++;
      
    timer = millis();
  }

  if(!digitalRead(9)){
    if(b1){
      if(!nextHorizontalCollision(piece, -1)){
        pieceX--;
        refresh();
        delay(0.1*1000);

        
      }
      b1 = false;
    }
  }else{ 
    b1 = true;
  }

  if(!digitalRead(5)){  
    if(b2){
      if(!nextHorizontalCollision(piece, 1)){
        pieceX++;
        refresh();
        delay(0.1*1000);
      }
      b2 = false;
    }
  }else{ 
    b2 = true;
  }
  
  if(!digitalRead(15)){
    interval = 20;
  }else{
    interval = 400;
  }

  if(!digitalRead(10)){
    if(b3){
      if(rotation == getMaxRotation(currentType) - 1 && canRotate(0)){
        rotation = 0;
      }else if(canRotate(rotation + 1)){
        rotation++;
        delay(0.1*1000);
      }
        
      copyPiece(piece, currentType, rotation);
      refresh();
      
      b3 = false;
      delayer = millis();
    }
  }else if(millis() - delayer > 50){ 
    b3 = true;
  }
  

}






void checkLines(){
  boolean full;
  for(short y = 17; y >= 0; y--){
    full = true;
    for(short x = 0; x < 10; x++){
      full = full && grid[x][y];
    }
    if(full){
      breakLine(y);
      y++;
    }
  }
}

void breakLine(short line){
  for(short y = line; y >= 0; y--){
    for(short x = 0; x < 10; x++){
      grid[x][y] = grid[x][y-1];
    }
  }
  for(short x = 0; x < 10; x++){
     grid[x][0] = 0;
  }
  display.invertDisplay(true);
  delay(50);
  display.invertDisplay(false);
  score += 10;
}

void refresh(){
    display.clearDisplay();
    drawLayout();
    drawGrid();
    drawPiece(currentType, 0, pieceX, pieceY);
    display.display();
}

void drawGrid(){
  for(short x = 0; x < 10; x++)
    for(short y = 0; y < 18; y++)
      if(grid[x][y])
        display.fillRect(MARGIN_LEFT + (SIZE + 1)*x, MARGIN_TOP + (SIZE + 1)*y, SIZE, SIZE, WHITE);
}

boolean nextHorizontalCollision(short piece[2][4], int amount){
  for(short i = 0; i < 4; i++){
    short newX = pieceX + piece[0][i] + amount;
    if(newX > 9 || newX < 0 || grid[newX][pieceY + piece[1][i]])
      return true;
  }
  return false;
}

boolean nextCollision(){

  for(short i = 0; i < 4; i++){
    short y = pieceY + piece[1][i] + 1;
    short x = pieceX + piece[0][i];
    if(y > 17 || grid[x][y])
      return true;
  }

  return false;
}

void generate(){
  currentType = nextType;
  nextType = random(TYPES);
  if(currentType != 5)
    pieceX = random(9);
  else
    pieceX = random(7);
  pieceY = 0;
  rotation = 0;
  copyPiece(piece, currentType, rotation);
}


void drawPiece(short type, short rotation, short x, short y){
  for(short i = 0; i < 4; i++)
    display.fillRect(MARGIN_LEFT + (SIZE + 1)*(x + piece[0][i]), MARGIN_TOP + (SIZE + 1)*(y + piece[1][i]), SIZE, SIZE, WHITE);
}

void drawNextPiece(){
  short nPiece[2][4];
  copyPiece(nPiece, nextType, 0);
  for(short i = 0; i < 4; i++)
    display.fillRect(50 + 3*nPiece[0][i], 4 + 3*nPiece[1][i], 2, 2, WHITE);
}

void copyPiece(short piece[2][4], short type, short rotation){
  switch(type){
  case 0: //L_l
    for(short i = 0; i < 4; i++){
      piece[0][i] = pieces_L_l[rotation][0][i];
      piece[1][i] = pieces_L_l[rotation][1][i];
    }
    break;
   case 1: //S_l
    for(short i = 0; i < 4; i++){
      piece[0][i] = pieces_S_l[rotation][0][i];
      piece[1][i] = pieces_S_l[rotation][1][i];
    }
    break;
   case 2: //S_r
    for(short i = 0; i < 4; i++){
      piece[0][i] = pieces_S_r[rotation][0][i];
      piece[1][i] = pieces_S_r[rotation][1][i];
    }
    break;
   case 3: //Sq
    for(short i = 0; i < 4; i++){
      piece[0][i] = pieces_Sq[0][0][i];
      piece[1][i] = pieces_Sq[0][1][i];
    }
    break;
    case 4: //T
    for(short i = 0; i < 4; i++){
      piece[0][i] = pieces_T[rotation][0][i];
      piece[1][i] = pieces_T[rotation][1][i];
    }
    break;
    case 5: //l
    for(short i = 0; i < 4; i++){
      piece[0][i] = pieces_l[rotation][0][i];
      piece[1][i] = pieces_l[rotation][1][i];
    }
    break;
  }
}

short getMaxRotation(short type){
  if(type == 1 || type == 2 || type == 5)
    return 2;
  else if(type == 0 || type == 4)
    return 4;
  else if(type == 3)
    return 1;
  else 
    return 0;
}

boolean canRotate(short rotation){
  short piece[2][4];
  copyPiece(piece, currentType, rotation);
  return !nextHorizontalCollision(piece, 0);
}

void drawLayout(){
  display.drawLine(0, 15, WIDTH, 15, WHITE);
  display.drawRect(0, 0, WIDTH, HEIGHT, WHITE);
  drawNextPiece();
  char text[6];
  itoa(score, text, 10);
  drawText(text, getNumberLength(score), 7, 4);
}

short getNumberLength(int n){
  short counter = 1;
  while(n >= 10){
    n /= 10;
    counter++;
  }
  return counter;
}

void drawText(char text[], short length, int x, int y){
  display.setTextSize(1);      // Normal 1:1 pixel scale
  display.setTextColor(WHITE); // Draw white text
  display.setCursor(x, y);     // Start at top-left corner
  display.cp437(true);         // Use full 256 char 'Code Page 437' font

  for(short i = 0; i < length; i++)
    display.write(text[i]);
}
Credits

Piyush Garg

1 project • 0 followers
Hi! My name is Piyush, exploring electronics while making cool and intresting projects!
Mini TETRIS (GAMBOY)

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Mini TETRIS (GAMBOY)

Mini TETRIS (GAMBOY)

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Schematics

pins

Code

TETRIS

Credits

Piyush Garg

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