| “ | In the Inventor's Workshop you can research and upgrade your defensive fortification technologies. By upgrading the technology, you can strengthen your line of defense and protect your kingdom and its treasure. | „ |
The maximum level you can upgrade a structure is shown in the tables below. You can level up construction for 3 or 4 times. Each time you upgrade a plan, you will allow upgrading that at the Maximum Research Level listed near the column of plans. So if you want to upgrade an Arrow Tower to level 6, you have first to upgrade "Plan Arrow Tower level 2" which allows you to upgrade then it.
Research Levels[]
| Inventor's Workshop Levels → |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
3 ➤ | 6 ➤ | 9 ➤ | 20 ➤ | 21 ➤ | |||||||||
|
3 ➤ | 6 ➤ | 9 ➤ | 21 ➤ | 22 ➤ | |||||||||
|
3 ➤ | 6 ➤ | 9 ➤ | 21 ➤ | 22 ➤ | |||||||||
|
3 ➤ | 6 ➤ | 9 ➤ | 20 ➤ | 21 ➤ | |||||||||
|
3 ➤ | 6 ➤ | 9 ➤ | 20 ➤ | 21 ➤ | |||||||||
|
3 ➤ | 6 ➤ | 9 ➤ | 20 ➤ | 21 ➤ | |||||||||
|
3 ➤ | 6 ➤ | 10 ➤ | 18 ➤ | 19 ➤ | |||||||||
|
3 ➤ | 6 ➤ | 10 ➤ | 18 ➤ | 19 ➤ | |||||||||
|
3 ➤ | 6 ➤ | 10 ➤ | 18 ➤ | 19 ➤ | |||||||||
|
3 ➤ | 9 ➤ | 17 ➤ | 18 ➤ | ||||||||||
|
9 ➤ | 11 ➤ | 12 ➤ | |||||||||||
|
9 ➤ | 11 ➤ | 12 ➤ | |||||||||||
|
8 ➤ | 9 ➤ | ||||||||||||
|
4 ➤ | 5 ➤ | ||||||||||||
Levels[]
| Level | Requirement | Upgrade Cost | Upgrade Time | Unlocked Structure |
|---|---|---|---|---|
| 1 |  Level 1
|
 1K
|
FREE | Arrow Tower Barricade
|
| 2 | 3K
|
 2m
|
Spikes
| |
| 3 | Level 2
|
10K
|
30m
|
Bomb Tower
|
| 4 | Level 3
|
25K
|
1h
|
Frost Tower
|
| 5 | Level 4
|
50K
|
4h
|
Blockade
|
| 6 | Level 5
|
100K
|
12h
|
Gargoyle Tower
|
| 7 | Level 6
|
250K
|
1d
|
Firebolt Tower
|
| 8 | Level 7
|
500K
|
2d
|
Snake Tower
|
| 9 | Level 8
|
1M
|
3d
|
Skull Tower
|
| 10 | Level 9
|
2M
|
4d
|
|
| 11 | Level 10
|
6M
|
5d
|
Lightning Tower
|
| 12 | Level 11
|
8M
|
6d
|
Heal Tower Jester Box
|
| 13 | Level 12
|
10M
|
7d
|
Basilisk Tower
|
| 13 | Level 13
|
15M
|
7d
|
Plan Arrow Tower[]
| Picture | Level | Max. Research Level | Upgrade Cost | Upgrade Time | Inventor's Workshop Level Required |
|---|---|---|---|---|---|
 |
1 | 3 | Unlock with  Inventor's Workshop lvl 1
| ||
| 2 | 6 | 50K
|
4h 30min
|
Level 3 | |
| 3 | 9 | 250K
|
1d 12h
|
Level 7 | |
| 4 | 20 | 750K
|
3d
|
Level 9 | |
| 5 | 21 | 1.5M
|
4d 12h
|
Level 14 | |
Plan Barricade[]
| Picture | Level | Max. Research Level | Upgrade Cost | Upgrade Time | Inventor's Workshop Level Required |
|---|---|---|---|---|---|
 |
1 | 3 | Unlock with Inventor's Workshop lvl 1
| ||
| 2 | 6 | 25K
|
3h
|
Level 2 | |
| 3 | 9 | 150K
|
1d
|
Level 5 | |
| 4 | 21 | 350K
|
2d
|
Level 8 | |
| 5 | 22 | 700K
|
3d
|
Level 14 | |
Plan Spikes[]
| Picture | Level | Max. Research Level | Upgrade Cost | Upgrade Time | Inventor's Workshop Level Required |
|---|---|---|---|---|---|
 |
1 | 3 | Unlock with Inventor's Workshop lvl 2
| ||
| 2 | 6 | 50K
|
4h 30min
|
Level 4 | |
| 3 | 9 | 250K
|
1d 12h
|
Level 7 | |
| 4 | 21 | 750K
|
3d
|
Level 10 | |
| 5 | 22 | 1.5M
|
4d 12h
|
Level 14 | |
Plan Bomb Tower[]
| Picture | Level | Max. Research Level | Upgrade Cost | Upgrade Time | Inventor's Workshop Level Required |
|---|---|---|---|---|---|
 |
1 | 3 | Unlock with Inventor's Workshop lvl 3
| ||
| 2 | 6 | 150K
|
4h 30min
|
Level 6 | |
| 3 | 9 | 750K
|
1d 12h
|
Level 8 | |
| 4 | 20 | 1M
|
3d
|
Level 10 | |
| 5 | 21 | 2M
|
4d 12h
|
Level 14 | |
Plan Frost Tower[]
| Picture | Level | Max. Research Level | Upgrade Cost | Upgrade Time | Inventor's Workshop Level Required |
|---|---|---|---|---|---|
 |
1 | 3 | Unlock with Inventor's Workshop lvl 4
| ||
| 2 | 6 | 250K
|
4h 30min
|
Level 6 | |
| 3 | 9 | 750K
|
1d 12h
|
Level 8 | |
| 4 | 20 | 1.25M
|
3d
|
Level 10 | |
| 5 | 21 | 2.5M
|
4d 12h
|
Level 14 | |
Plan Blockade[]
| Picture | Level | Max. Research Level | Upgrade Cost | Upgrade Time | Inventor's Workshop Level Required |
|---|---|---|---|---|---|
 |
1 | 3 | Unlock with Inventor's Workshop lvl 5
| ||
| 2 | 6 | 150K
|
4h 30min
|
Level 7 | |
| 3 | 9 | 750K
|
1d 12h
|
Level 8 | |
| 4 | 20 | 1.5M
|
3d
|
Level 10 | |
| 5 | 21 | 3M
|
6d
|
Level 14 | |
Plan Gargoyle Tower[]
| Picture | Level | Max. Research Level | Upgrade Cost | Upgrade Time | Inventor's Workshop Level Required |
|---|---|---|---|---|---|
 |
1 | 3 | Unlock with Inventor's Workshop lvl 6
| ||
| 2 | 6 | 1M
|
1d 18h
|
Level 8 | |
| 3 | 10 | 2M
|
3d 12h
|
Level 10 | |
| 4 | 18 | 3M
|
5d 6h
|
Level 11 | |
| 5 | 19 | 4M
|
5d 6h
|
Level 14 | |
Plan Firebolt Tower[]
| Picture | Level | Max. Research Level | Upgrade Cost | Upgrade Time | Inventor's Workshop Level Required |
|---|---|---|---|---|---|
 |
1 | 3 | Unlock with Inventor's Workshop lvl 7
| ||
| 2 | 6 | 2M
|
2d 12h
|
Level 9 | |
| 3 | 10 | 3.5M
|
4d 12h
|
Level 10 | |
| 4 | 18 | 5M
|
5d
|
Level 11 | |
| 5 | 19 | 8M
|
6d 18h
|
Level 14 | |
Plan Snake Tower[]
| Picture | Level | Max. Research Level | Upgrade Cost | Upgrade Time | Inventor's Workshop Level Required |
|---|---|---|---|---|---|
 |
1 | 3 | Unlock with Inventor's Workshop lvl 8
| ||
| 2 | 6 | 1M
|
2d
|
Level 9 | |
| 3 | 10 | 2.5M
|
3d
|
Level 10 | |
| 4 | 18 | 3.5M
|
4d
|
Level 11 | |
| 5 | 19 | 5M
|
6d
|
Level 14 | |
Plan Skull Tower[]
| Picture | Level | Max. Research Level | Upgrade Cost | Upgrade Time | Inventor's Workshop Level Required |
|---|---|---|---|---|---|
 |
1 | 3 | Unlock with Inventor's Workshop lvl 9
| ||
| 2 | 6 | 3M
|
2d 6h
|
Level 10 | |
| 3 | 9 | 4M
|
3d 9h
|
Level 10 | |
| 4 | 17 | 5M
|
4d 12h
|
Level 11 | |
| 5 | 18 | 8M
|
6d 18h
|
Level 14 | |
Plan Lightning Tower[]
| Picture | Level | Max. Research Level | Upgrade Cost | Upgrade Time | Inventor's Workshop Level Required |
|---|---|---|---|---|---|
 |
1 | 3 | Unlock with Inventor's Workshop lvl 11
| ||
| 2 | 6 | 4M
|
2d 6h
|
Level 11 | |
| 3 | 9 | 5M
|
4d 12h
|
Level 11 | |
| 4 | 11 | 6M
|
4d 12h
|
Level 12 | |
| 5 | 12 | 10M
|
6d 18h
|
Level 14 | |
Plan Heal Tower[]
| Picture | Level | Max. Research Level | Upgrade Cost | Upgrade Time | Inventor's Workshop Level Required |
|---|---|---|---|---|---|
 |
1 | 3 | Unlock with Inventor's Workshop lvl 12
| ||
| 2 | 6 | 4M
|
2d 6h
|
Level 12 | |
| 3 | 9 | 5M
|
4d 12h
|
Level 12 | |
| 4 | 11 | 6M
|
4d 12h
|
Level 13 | |
| 5 | 12 | 9M
|
6d 18h
|
Level 14 | |
Plan Jester Box[]
| Picture | Level | Max. Research Level | Upgrade Cost | Upgrade Time | Inventor's Workshop Level Required |
|---|---|---|---|---|---|
 |
1 | 3 | Unlock with Inventor's Workshop lvl 12
| ||
| 2 | 6 | 4M
|
2d
|
Level 12 | |
| 3 | 8 | 5M
|
3d
|
Level 12 | |
| 4 | 9 | 7M
|
4d
|
Level 14 | |
Plan Basilisk Tower[]
| Picture | Level | Max. Research Level | Upgrade Cost | Upgrade Time | Inventor's Workshop Level Required |
|---|---|---|---|---|---|
 |
1 | 3 | Unlock with Inventor's Workshop lvl 13
| ||
| 2 | 4 | 5M
|
3d
|
Level 13 | |
| 3 | 5 | 10M
|
5d
|
Level 14 | |