private void setCandidates(Game game) {
        for (int y = 0; y < 9; y++) {
            for (int x = 0; x < 9; x++) {
                fields[y][x].setBackground(Color.WHITE);
                if (game.isHelp() && game.isSelectedNumberCandidate(x, y))
                    fields[y][x].setBackground(COLOR_CANDIDATE);
            }
        }
    }