When the spark of civilization is on the verge of dying out, books become the most precious legacy. The bookstore owner is said to have a particular fondness for scientific research books - trade the right items and you might gain an unexpected reward.
UPGRADES
| Level | Food/Wood | Zent | Time | Prerequisite | Zent Yields |
|---|---|---|---|---|---|
| 1 | 850 | 3s | Lvl. 12 Headquarters | 2% | |
| 2 | 1.2K | 12m 24s | 4% | ||
| 3 | 1.9K | 23m 34s | 6% | ||
| 4 | 2.8K | 44m 46s | 8% | ||
| 5 | 5.7K | 53m 44s | 10% | ||
| 6 | 17.1K | 1h 4m 29s | 12% | ||
| 7 | 34.2K | 1h 17m 22s | 14% | ||
| 8 | 54.8K | 1h 40m 35s | 16% | ||
| 9 | 87.7K | 2h 10m 45s | 18% | ||
| 10 | 105.3K | 3h 3m 4s | 20% | ||
| 11 | 263.2K | 4h 16m 18s | 22% | ||
| 12 | 447.5K | 5h 2m 28s | 24% | ||
| 13 | 26% | ||||
| 14 | 28% | ||||
| 15 | 30% | ||||
| 16 | 32% | ||||
| 17 | 34% | ||||
| 18 | 3.90M | 3d 1h 49m 55s | 36% | ||
| 19 | 4.68M | 4d 7h 21m 53s | 38% | ||
| 20 | 40% | ||||
| 21 | 11.81M | 9d 8h 18m 6 | 42% | ||
| 22 | 44% | ||||
| 23 | 46% | ||||
| 24 | 24.00M | 23d 19h 31m 15s | 48% | ||
| 25 | 50% | ||||
| 26 | 54. 26M | 40d 5h 52m 13s | 52% | ||
| 27 | 54% | ||||
| 28 | 56% | ||||
| 29 | 58% | ||||
| 30 | 60% | ||||
| 31 | 62% | ||||
| 32 | 64% | ||||
| 33 | 66% | ||||
| 34 | 68% | ||||
| 35 | 70% |
Add comment
Comments