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Upgrade City Wall to increase City Defense limit.
You can activate Defense Tower at City Wall Lv.10
City Wall upgrade Requirements:
Lv. = Level
F = Food
O = Oil
S = Steel
M = Minerals
U = Uranium
R = Requirement (MH = Main Hall)
CDL = City Defense Limit
BP = Battle Power
BCT = Base Construction Time
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| Lv. | Food | Oil | Steel | Minerals | Uranium | Requirement | CDL | BP | BCT |
| 1 | – | Free | – | – | – | MH Lv.1 | 300 | 10 | 0:00 |
| 2 | – | 2,360 | – | – | – | MH Lv.2 | 600 | 29 | 0:00 |
| 3 | – | 3,620 | – | – | – | MH Lv.3 | 900 | 58 | 0:00 |
| 4 | – | 6,120 | – | – | – | MH Lv.4 | 1,200 | 111 | 0:00 |
| 5 | – | 10,010 | – | – | – | MH Lv.5 | 1,500 | 204 | 12:00 |
| 6 | – | 19,460 | – | – | – | MH Lv.6 | 1,800 | 354 | 01:12:00 |
| 7 | – | 38,650 | – | – | – | MH Lv.7 | 2,100 | 581 | 02:24:00 |
| 8 | – | 69,770 | – | – | – | MH Lv.8 | 2,400 | 906 | 03:36:00 |
| 9 | – | 117,100 | – | – | – | MH Lv.9 | 2,700 | 1,351 | 06:00:00 |
| 10 | – | 189,070 | – | – | – | MH Lv.10 | 3,000 | 1,940 | 08:24:00 |
| 11 | – | 380,760 | – | – | – | MH Lv.11 | 3,300 | 2,698 | 11:38:20 |
| 12 | – | 684,750 | – | – | – | MH Lv.12 | 3,600 | 3,653 | ? |
| 13 | – | 1,112,620 | – | – | – | MH Lv.13 | 3,900 | 4,834 | ? |
| 14 | – | 2,268,060 | – | – | – | MH Lv.14 | 4,200 | 6,271 | ? |
| 15 | – | 4,082,420 | – | – | – | MH Lv.15 | 4,600 | 7,996 | ? |
| Lv. | Food | Oil | Steel | Minerals | Uranium | Requirement | CDL | BP | BCT |
| 16 | – | 4,776,410 | 238,820 | – | – | MH Lv.16 | 5,000 | 10,042 | ? |
| 17 | – | 6,036,880 | 517,440 | – | – | MH Lv.17 | 5,400 | 12,445 | ? |
| 18 | – | 6,726,970 | 896,920 | – | – | MH Lv.18 | 5,800 | 15,242 | ? |
| 19 | – | 6,923,270 | 1,384,650 | – | – | MH Lv.19 | 6,200 | 18,471 | ? |
| 20 | – | 8,052,810 | 1,610,560 | – | – | MH Lv.20 | 6,600 | 22,172 | ? |
| Lv. | Food | Oil | Steel | Minerals | Uranium | Requirement | CDL | BP | BCT |
| 21 | – | 8,374,990 | 1,674,990 | 418,740 | – | MH Lv.21 | 7,000 | 26,386 | ? |
| 22 | – | 8,966,140 | 1,793,220 | 768,520 | – | MH Lv.22 | 7,400 | 31,157 | ? |
| 23 | – | 11,146,280 | 2,229,250 | 955,390 | – | MH Lv.23 | 7,800 | 36,530 | ? |
| 24 | – | 14,774,380 | 2,954,870 | 1,266,370 | – | MH Lv.24 | 8,200 | 42,551 | ? |
| 25 | – | 19,576,030 | 3,915,200 | 1,677,940 | – | MH Lv.25 | 8,700 | 49,268 | ? |
| 26 | – | 22,224,780 | 4,444,950 | 2,963,300 | – | MH Lv.26 | 9,200 | 56,730 | ? |
| 27 | – | 29,427,510 | 5,885,500 | 3,923,660 | – | MH Lv.27 | 9,700 | 64,989 | ? |
| 28 | – | 38,256,060 | 7,651,210 | 5,100,800 | – | MH Lv.28 | 10,200 | 74,098 | ? |
| 29 | – | 49,732,680 | 9,946,530 | 6,631,020 | – | MH Lv.29 | 10,700 | 84,111 | ? |
| 30 | – | 64,652,570 | 12,930,510 | 8,620,340 | – | MH Lv.30 | 11,200 | 95,084 | ? |
| Lv. | Food | Oil | Steel | Minerals | Uranium | Requirement | CDL | BP | BCT |
| 31 | – | 84,048,280 | 16,809,650 | 11,206,430 | 19,480 | MH Lv.31 | 11,700 | 110,297 | ? |
| 32 | – | 107,581,740 | 21,516,340 | 14,344,220 | 32,160 | MH Lv.32 | 12,200 | 126,842 | ? |
| 33 | – | 135,552,920 | 27,110,570 | 18,073,700 | 55,930 | MH Lv.33 | 12,700 | 144,600 | ? |
| 34 | – | 168,085,750 | 33,617,130 | 22,411,400 | 84,690 | MH Lv.34 | 13,200 | 163,398 | ? |
| 35 | – | 208,426,430 | 41,685,260 | 27,790,150 | 125,640 | MH Lv.35 | 13,700 | 183,066 | ? |
| 36 | – | 222,703,590 | 44,540,690 | 29,693,760 | 149,660 | MH Lv.36 | 14,200 | 204,052 | ? |
| 37 | – | 235,176,280 | 47,035,220 | 31,356,780 | 173,190 | MH Lv.37 | 14,700 | 226,498 | ? |
| 38 | – | 247,933,830 | 49,586,720 | 33,057,780 | 199,420 | MH Lv.38 | 15,200 | 250,281 | ? |
| 39 | – | 247,958,620 | 49,591,670 | 33,061,080 | 219,360 | MH Lv.39 | 15,700 | 275,310 | ? |
| 40 | – | 247,983,410 | 49,596,620 | 33,064,380 | 241,290 | MH Lv.40 | 16,200 | 302,841 | ? |
| 41 | – | 248,008,200 | 49,601,570 | 33,067,680 | 265,430 | MH Lv.41 | 16,700 | 333,126 | ? |
| Lv. | Food | Oil | Steel | Minerals | Uranium | Requirement | CDL | BP | BCT |
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