From Inselkampf
The stone wall is for the protection of the entire island. The more the stone wall is built up, the more difficult it becomes for your enemies to attack your island. Without a stone wall, your island has an attack and defence value of 50.
Level | Strength(def & off) | Incremental Upgrade cost to this level |
Gold | Stone | Lumber |
Lv0 | 50 | | | |
Lv1 | 62 | 100 | 150 | 50 |
Lv2 | 78 | 120 | 180 | 60 |
Lv3 | 97 | 144 | 216 | 72 |
Lv4 | 122 | 172 | 259 | 86 |
Lv5 | 152 | 207 | 311 | 103 |
Lv6 | 190 | 248 | 373 | 124 |
Lv7 | 238 | 298 | 447 | 149 |
Lv8 | 298 | 358 | 537 | 179 |
Lv9 | 372 | 429 | 644 | 214 |
Lv10 | 465 | 515 | 773 | 257 |
Lv11 | 582 | 619 | 928 | 309 |
Lv12 | 727 | 743 | 1114 | 371 |
Lv13 | 909 | 891 | 1337 | 445 |
Lv14 | 1136 | 1069 | 1604 | 534 |
Lv15 | 1421 | 1283 | 1925 | 641 |
Lv16 | 1776 | 1540 | 2311 | 770 |
Lv17 | 2220 | 1848 | 2773 | 924 |
Lv18 | 2775 | 2218 | 3327 | 1109 |
Lv19 | 3469 | 2662 | 3993 | 1331 |
Lv20 | 4336 | 3194 | 4792 | 1597 |