Learn to create a HTML5 Game in 5 Minutes - Game Scene

game-scene.ts

  private addNewRowOfPipes(): void {
    // update the score
    this.registry.values.score += 1;
    this.scoreText.setText(this.registry.values.score);

    // randomly pick a number between 1 and 5
    let hole = Math.floor(Math.random() * 5) + 1;

    // add 6 pipes with one big hole at position hole and hole + 1
    for (let i = 0; i < 10; i++) {
      if (i !== hole && i !== hole + 1 && i !== hole + 2) {
        if (i === hole - 1) {
          this.addPipe(400, i * 60, 0);
        } else if (i === hole + 3) {
          this.addPipe(400, i * 60, 1);
        } else {
          this.addPipe(400, i * 60, 2);
        }
      }
    }
  }