Задача решена, но не проходит проверку

package com.javarush.games.game2048; import com.javarush.engine.cell.*; public class Game2048 extends Game { private static final int SIDE = 4; private int[][] gameField = new int[SIDE][SIDE]; private boolean compressRow(int[] row) { boolean result = false; int changes = 1; while (changes > 0) { changes = 0; for (int i = 0; i < row.length - 1; i++) { if (row[i] == 0 && row[i + 1] > 0) { row[i] = row[i + 1]; row[i + 1] = 0; changes++; result = true; } } } return result; } private boolean mergeRow(int[] row) { boolean result = false; for (int i = 0; i < row.length - 1; i++) { if (row[i] == row[i + 1] && row[i] != 0) { row[i] += row[i + 1]; row[i + 1] = 0; result = true; } } return result; } private void moveLeft() { int methodCounter = 0; for(int y = 0; y < SIDE; y++) { if(compressRow(gameField[y])) methodCounter++; } for(int y = 0; y < SIDE; y++) { if(mergeRow(gameField[y])) methodCounter++; } for(int y = 0; y < SIDE; y++) { if(compressRow(gameField[y])) methodCounter++; } if (methodCounter > 0) createNewNumber(); drawScene(); } private void moveRight() { drawScene(); } private void moveUp() { drawScene(); } private void moveDown() { drawScene(); } @Override public void onKeyPress(Key key) { if (key == Key.LEFT) moveLeft(); else if (key == Key.RIGHT) moveRight(); else if (key == Key.UP) moveUp(); else if (key == Key.DOWN) moveDown(); } public void initialize() { setScreenSize(SIDE, SIDE); createGame(); drawScene(); } private void createGame() { createNewNumber(); createNewNumber(); } private void drawScene() { for(int y = 0; y < SIDE; y++) { for(int x = 0; x < SIDE; x++) { setCellColoredNumber(x, y, gameField[y][x]); } } } private void createNewNumber() { int x ,y; do { x = getRandomNumber(SIDE); y = getRandomNumber(SIDE); } while (gameField[y][x] != 0); if (getRandomNumber(10) == 1) gameField[y][x] = 4; else gameField[y][x] = 2; } private Color getColorByValue(int value) { if (value == 0) return Color.WHITE; else if (value == 2) return Color.LIGHTPINK; else if (value == 4) return Color.VIOLET; else if (value == 8) return Color.DEEPSKYBLUE; else if (value == 16) return Color.AQUAMARINE; else if (value == 32) return Color.FORESTGREEN; else if (value == 64) return Color.LIMEGREEN; else if (value == 128) return Color.ORANGE; else if (value == 256) return Color.DARKORANGE; else if (value == 512) return Color.ORANGERED; else if (value == 1024) return Color.HOTPINK; else return Color.DEEPPINK; } private void setCellColoredNumber(int x, int y, int value) { //setCellValueEx(int x, int y, Color cellColor, String value) String s = ""; s += value; if (value == 0) setCellValueEx(x, y, getColorByValue(value), ""); else setCellValueEx(x, y, getColorByValue(value), s); } }