Tank Force/Rounds 13-24

Round 13
This is a medium-difficulty level. Steel blocks make it tricky to get a clear fire corridor. Enemies here consists of basic tanks at first but quickly fast and armored tanks show up. Fortunately, enemies are short in supply here so time needed to defend the base isn't long.
 * This round contains twelve Normal Tanks, four Fast Tanks, and four Hard Tanks. Three powerups will also appear on this round.
 * This round, along with the next two, also feature the last unique song to be heard from the Yamaha YM-2151 before they'll repeat.
 * The minimum amount of points you'll gain from clearing this round is 11200 and the maximum is 20200 (if all powerups are 3000).

Round 14
This layout lacks of long fire corridors, but gives plenty of opportunities for cheap shots where you can shoot enemies without retaliation. This round is also pretty long and has strong enemy firepower, especially near the end of the level.
 * This round contains four Normal Tanks, four Fast Tanks, eight Hard Tanks, five Big Tanks, ten Jeeps and four Rapid Tanks. All but one type of regular enemy (the Tomahawk Tank, to be precise) is present on this round, and nine powerups appear on this round.
 * The seven groups of steel blocks that are in the centre of this round are also arranged to look like a space station from Bosconian.
 * The minimum amount of points you'll gain from clearing this round is 29800 and the maximum is 56800 (if all powerups are 3000).


 * 1 and 2 player tactics:
 * You'll need to be constantly on the move when not having a good firepower.

Round 15
Here is another difficulty leap. Enemies can approach the base from all three directions and there's no steel blocks to cover the path to the center and destructible blocks are probably cleared towards the end of the level. Most of the enemies approach the base from the right but some also appear on the left.
 * This round contains eight Normal Tanks, twelve Fast Tanks, and five Hard Tanks. Nine powerups will also appear on this round.
 * As your tanks and the enemy tanks pass under the palm trees on this round, your views of them and any shots will be obscured.
 * The minimum amount of points you'll gain from clearing this round is 15400 and the maximum is 42400 (if all powerups are 3000).


 * 1 player tactics:
 * You should play very carefully here and stay near the bottom of the screen whenever enemies close in from multiple directions.

Round 16

 * This round contains the second appearance of AK-1, nine Normal Tanks, two Fast Tanks, two Hard Tanks, and two Rapid Tanks. Six powerups will also appear on this round, and each of AK-1's turrets takes fifteen hits to destroy, making a total of forty-five hits.
 * The minimum amount of points you'll gain from clearing this round is 25200 and the maximum is 43200 (if all powerups are 3000).

Round 17

 * This round contains twenty Normal Tanks, eight Fast Tanks, eight Hard Tanks, and four Jeeps. 6 power ups appear on this round.
 * The yellow walls in the centre of the round are also made to look like Pac-Man.
 * The minimum amount of points you'll gain from clearing this round is 24000 and the maximum is 51000 (if all powerups are 3000).

Round 18
Last level of the first half of the stage is a hard one. A small water body north of the headquarters makes switching between defensive positions to be long and there's very inconveniently placed small steel block just northwest of there. Moreover, most of the enemies here are fast tanks and you have to endure quite a long time too.
 * This round contains twenty Normal Tanks and twenty Fast Tanks. A total of nine powerups will also appear on this "halfway" round.
 * The pools of water in this round can't be crossed over by either your tanks or the enemy tanks, but they can be fired over with shots.
 * The minimum amount of points you'll gain from clearing this round is 20000 and the maximum is 51000 (if all powerups are 3000).

Round 19

 * This round contains twenty Normal Tanks, four Fast Tanks, eight Hard Tanks and three Tomahawk Tanks. Six powerups will also appear on this round. The Tomahawk Tank is the largest enemy in this game (twice the size of others), and takes eight hits to kill.
 * The minimum amount of points you'll gain from clearing this round is 24400 and the maximum is 42400 (if all powerups are 3000).

Round 20

 * This round contains three first-type Train Cannons, ten Normal Tanks, four Hard Tanks, four Jeeps and two Rapid Tanks. And once again, the first-type Train Cannons have a single bullet-firing cannon mounted on the centre of their roofs, and take eight hits to kill.
 * The minimum amount of points you'll gain from clearing this round is 26600 and the maximum is 53600 (if all powerups are 3000).

Round 21

 * This round contains twenty Normal Tanks, fourteen Hard Tanks, four Jeeps, and two Rapid Tanks. 9 powerups appear this round.
 * There are thirteen formations of steel blocks on this round, which you can use to hide behind as the enemies cannot destroy them.
 * The minimum amount of points you'll gain from clearing this round is 28600 and the maximum is 55600 (if all powerups are 3000).

Round 22

 * This round contains fifteen Normal Tanks, ten Fast Tanks, two Hard Tanks and three Big Tanks. 9 powerups appear on this round.
 * The pools of water in this round can't be crossed over by either your tanks or the enemy tanks, but they can be fired over with shots.
 * The minimum amount of points you'll gain from clearing this round is 18500 and the maximum is 45500 (if all powerups are 3000).

Round 23

 * This round contains five Normal Tanks, three Big Tanks, and twenty-two Jeeps. A total of nine powerups will appear on this round.
 * There are forty-three walls of steel blocks upon this round, which you can use to hide behind, as the enemies cannot destroy them.
 * The minimum amount of points you'll gain from clearing this round is 24100 and the maximum is 51100 (if all powerups are 3000).

Round 24

 * This round contains the first appearances of AK-2, along with fourteen Jeeps. A total of nine powerups will appear upon this round.
 * Each of AK-2's turrets will fire two bullets at you while pointing down and takes five hits to destroy, making a total of twenty hits in all.
 * The minimum amount of points you'll gain from clearing this round is 37200 and the maximum is 64200 (if all powerups are 3000).