The numerical collapse in the latter part is too great. With 120 million q, you can only kill level 21 mobs with 56 stacks and get knocked to death by level 14 monsters. If the defense tower is higher, it should only be about 60 levels. Rely on q. There is basically no improvement when it comes to improving. The numerical value of each subsequent layer of monsters is increased too much, but the q improvement is very little. The main improvement is only the small hourglass--by watching ads, you can stack the duration of Q by quickly stacking Q.