void checkCombo() {
    if (health > 0) {
      for (int i = 0; i < enemyList.size(); i++) {
        //  resets result if combo doesn't match player input
        enemyList.get(i).result = 0;
        if (enemyList.get(i).checkRange()) {
          //  loops through all enemies
          for (int j = 0; j < enemyList.get(i).enemyCombo.size(); j++) {
            //  checks if index is in range of array
            if (playerInput.size() > j && enemyList.get(i).enemyCombo.size() > j) {
              //  checks if player input matches enemy combo
              if (enemyList.get(i).enemyCombo.get(j) == playerInput.get(j)) {
                enemyList.get(i).result++;
                // checks if the entered combo is correct
                if (enemyList.get(i).result == playerInput.size()) {
                  //  if statements below replace the black combo icons with green ones if entered correctly by the player
                  if (enemyList.get(i).enemyComboButtons.get(j) == enemyList.get(i).upArrow) {
                    enemyList.get(i).enemyComboButtons.set(j, enemyList.get(i).upArrowCorrect);
                  }
                  else if (enemyList.get(i).enemyComboButtons.get(j) == enemyList.get(i).downArrow) {
                    enemyList.get(i).enemyComboButtons.set(j, enemyList.get(i).downArrowCorrect);
                  }
                  else if (enemyList.get(i).enemyComboButtons.get(j) == enemyList.get(i).leftArrow) {
                    enemyList.get(i).enemyComboButtons.set(j, enemyList.get(i).leftArrowCorrect);
                  }
                  else if (enemyList.get(i).enemyComboButtons.get(j) == enemyList.get(i).rightArrow) {
                    enemyList.get(i).enemyComboButtons.set(j, enemyList.get(i).rightArrowCorrect);
                  }
                  // check which sound needs to be loaded based on loop number
                  switch(j) {
                  case 0:
                    correctComboSound[0] = new AudioController(lightsOut, "audio/combo1.mp3");
                    break;
                  case 1:
                    correctComboSound[1] = new AudioController(lightsOut, "audio/combo2.mp3");
                    break;
                  case 2:
                    correctComboSound[2] = new AudioController(lightsOut, "audio/combo3.mp3");
                    break;
                  case 3:
                    correctComboSound[3] = new AudioController(lightsOut, "audio/combo4.mp3");
                    break;
                  case 4:
                    correctComboSound[4] = new AudioController(lightsOut, "audio/combo5.mp3");
                    break;
                  case 5:
                    correctComboSound[5] = new AudioController(lightsOut, "audio/combo6.mp3");
                    break;
                  case 6:
                    correctComboSound[6] = new AudioController(lightsOut, "audio/combo7.mp3");
                    break;
                  case 7:
                    correctComboSound[7] = new AudioController(lightsOut, "audio/combo8.mp3");
                    break;
                  case 8:
                    correctComboSound[8] = new AudioController(lightsOut, "audio/combo9.mp3");
                    break;
                  case 9:
                    correctComboSound[9] = new AudioController(lightsOut, "audio/combo10.mp3");
                    break;
                  }
                  // play correct sound
                  correctComboSound[j].play();
                }
              // if wrong key play wrong sound
              } else if (enemyList.get(i).enemyCombo.get(j) != playerInput.get(j) && enemyList.get(i).result > 0){
                wrongComboSound = new AudioController(lightsOut, "audio/wrongCombo.mp3");
                wrongComboSound.play();
              }
            }
            //  checks if the correct input by the player has the same length as the enemy combo
            if (enemyList.get(i).result == enemyList.get(i).enemyCombo.size()) {
              scoreList.add(new DrawScore(enemyList.get(i).x, enemyList.get(i).y, enemyList.get(i).reward, 5));
              if (enemyList.get(i).life == 1) {
                lifeList.add(new DrawScore(enemyList.get(i).x, enemyList.get(i).y, enemyList.get(i).reward, 10));
              }
              if(enemyList.get(i).health <= 1){
               PVector enemyPos = new PVector(enemyList.get(i).x,enemyList.get(i).y+enemyList.get(i).h/2);
               particleList.add(new ParticleSystem1(enemyPos));
              }
              enemyList.get(i).takeDamage();
              clearInput();
            }
          }
        }
      }
    }
  }