Free Upgrades are separated by each workshop: Attack, Defense and Utility. They provide a chance for their corresponding upgrade to level up for free during rounds after each wave. If the 
Wave Skip card activates, Free Upgrades can trigger an additional time per workshop for each wave skipped.
Free Upgrades are useful for idle afk gameplay when player can't manually upgrade the tower.
They can also be used to purchase expensive upgrades while doing longer runs, especially in the early-mid game, when newlu unlocked workshop upgrades are very expensive.
Free Upgrades will select the random Workshop upgrade from its category and add additional level to if for free. Cash cost for the upgrade will increase normally, as if it was purchased. Maxing out upgrades in the category will increase probabilities of Free Upgrade selecting the specific unmaxed upgrade you want.
Good example are Attack Upgrades, where most early game upgrades are cheap and maxed out and only Damage remains, that way it's being upgraded more. Costly upgrades like Super Critical, Enemy Skip Levels and others can be upgraded to the maximum during the longer runs for free without being upgraded between the runs for Coins.
Unlocked in 
Workshop for 800 coins after Coins/Kill Bonus and Coins/Wave. Unlocks Free Attack Upgrade, Free Defense Upgrade and Free Utility Upgrade. Each has 99 levels that increases the corresponding chance by 0.5% for a maximum chance of 49.5%. Free upgrades will not select a maxed stat so no free upgrades will be wasted if any stat can be upgraded.
Adds a chance for random Attack Workshop upgrade to be obtained for free after a wave.
| Level
|
Value
|
Coins
|
Total Coins
|
|---|
| 1
|
0.50%
|
75
|
75
|
| 2
|
1.00%
|
118
|
193
|
| 3
|
1.50%
|
171
|
364
|
| 4
|
2.00%
|
236
|
600
|
| 5
|
2.50%
|
314
|
914
|
| 6
|
3.00%
|
407
|
1.32K
|
| 7
|
3.50%
|
515
|
1.84K
|
| 8
|
4.00%
|
639
|
2.48K
|
| 9
|
4.50%
|
781
|
3.26K
|
| 10
|
5.00%
|
941
|
4.20K
|
| 11
|
5.50%
|
1.12K
|
5.32K
|
| 12
|
6.00%
|
1.32K
|
6.63K
|
| 13
|
6.50%
|
1.53K
|
8.16K
|
| 14
|
7.00%
|
1.77K
|
9.93K
|
| 15
|
7.50%
|
2.03K
|
11.96K
|
| 16
|
8.00%
|
2.30K
|
14.26K
|
| 17
|
8.50%
|
2.60K
|
16.86K
|
| 18
|
9.00%
|
2.92K
|
19.79K
|
| 19
|
9.50%
|
3.27K
|
23.05K
|
| 20
|
10.00%
|
3.63K
|
26.69K
|
| 21
|
10.50%
|
4.02K
|
30.71K
|
| 22
|
11.00%
|
4.43K
|
35.14K
|
| 23
|
11.50%
|
4.87K
|
40.01K
|
| 24
|
12.00%
|
5.33K
|
45.34K
|
| 25
|
12.50%
|
5.81K
|
51.15K
|
| 26
|
13.00%
|
6.32K
|
57.47K
|
| 27
|
13.50%
|
6.85K
|
64.33K
|
| 28
|
14.00%
|
7.41K
|
71.74K
|
| 29
|
14.50%
|
8.00K
|
79.73K
|
| 30
|
15.00%
|
8.60K
|
88.34K
|
| 31
|
15.50%
|
9.24K
|
97.58K
|
| 32
|
16.00%
|
9.90K
|
107.48K
|
| 33
|
16.50%
|
10.59K
|
118.06K
|
| 34
|
17.00%
|
11.30K
|
129.36K
|
| 35
|
17.50%
|
12.04K
|
141.41K
|
| 36
|
18.00%
|
12.81K
|
154.22K
|
| 37
|
18.50%
|
13.61K
|
167.82K
|
| 38
|
19.00%
|
14.43K
|
182.25K
|
| 39
|
19.50%
|
15.28K
|
197.53K
|
| 40
|
20.00%
|
16.16K
|
213.69K
|
| 41
|
20.50%
|
17.07K
|
230.75K
|
| 42
|
21.00%
|
18.00K
|
248.75K
|
| 43
|
21.50%
|
18.96K
|
267.72K
|
| 44
|
22.00%
|
19.96K
|
287.67K
|
| 45
|
22.50%
|
20.98K
|
308.65K
|
| 46
|
23.00%
|
22.03K
|
330.68K
|
| 47
|
23.50%
|
23.11K
|
353.79K
|
| 48
|
24.00%
|
24.22K
|
378.01K
|
| 49
|
24.50%
|
25.36K
|
403.37K
|
| 50
|
25.00%
|
26.53K
|
429.90K
|
| 51
|
25.50%
|
28.56K
|
458.46K
|
| 52
|
26.00%
|
29.83K
|
488.29K
|
| 53
|
26.50%
|
31.13K
|
519.41K
|
| 54
|
27.00%
|
32.46K
|
551.87K
|
| 55
|
27.50%
|
33.82K
|
585.69K
|
| 56
|
28.00%
|
35.21K
|
620.90K
|
| 57
|
28.50%
|
36.64K
|
657.54K
|
| 58
|
29.00%
|
38.10K
|
695.63K
|
| 59
|
29.50%
|
39.59K
|
735.22K
|
| 60
|
30.00%
|
41.11K
|
776.33K
|
| 61
|
30.50%
|
42.67K
|
818.99K
|
| 62
|
31.00%
|
44.25K
|
863.25K
|
| 63
|
31.50%
|
45.88K
|
909.12K
|
| 64
|
32.00%
|
47.53K
|
956.66K
|
| 65
|
32.50%
|
49.22K
|
1.01M
|
| 66
|
33.00%
|
50.94K
|
1.06M
|
| 67
|
33.50%
|
52.70K
|
1.11M
|
| 68
|
34.00%
|
54.49K
|
1.16M
|
| 69
|
34.50%
|
56.31K
|
1.22M
|
| 70
|
35.00%
|
58.17K
|
1.28M
|
| 71
|
35.50%
|
60.06K
|
1.34M
|
| 72
|
36.00%
|
61.99K
|
1.40M
|
| 73
|
36.50%
|
63.95K
|
1.46M
|
| 74
|
37.00%
|
65.94K
|
1.53M
|
| 75
|
37.50%
|
67.97K
|
1.60M
|
| 76
|
38.00%
|
73.54K
|
1.67M
|
| 77
|
38.50%
|
75.75K
|
1.75M
|
| 78
|
39.00%
|
77.99K
|
1.83M
|
| 79
|
39.50%
|
80.27K
|
1.91M
|
| 80
|
40.00%
|
82.59K
|
1.99M
|
| 81
|
40.50%
|
84.94K
|
2.07M
|
| 82
|
41.00%
|
87.33K
|
2.16M
|
| 83
|
41.50%
|
89.76K
|
2.25M
|
| 84
|
42.00%
|
92.23K
|
2.34M
|
| 85
|
42.50%
|
94.74K
|
2.44M
|
| 86
|
43.00%
|
97.28K
|
2.53M
|
| 87
|
43.50%
|
99.86K
|
2.63M
|
| 88
|
44.00%
|
102.48K
|
2.74M
|
| 89
|
44.50%
|
105.14K
|
2.84M
|
| 90
|
45.00%
|
107.84K
|
2.95M
|
| 91
|
45.50%
|
110.57K
|
3.06M
|
| 92
|
46.00%
|
113.35K
|
3.17M
|
| 93
|
46.50%
|
116.16K
|
3.29M
|
| 94
|
47.00%
|
119.02K
|
3.41M
|
| 95
|
47.50%
|
121.91K
|
3.53M
|
| 96
|
48.00%
|
124.84K
|
3.66M
|
| 97
|
48.50%
|
127.81K
|
3.78M
|
| 98
|
49.00%
|
130.82K
|
3.91M
|
| 99
|
49.50%
|
133.87K
|
4.05M
|
Adds a chance for random Defense Workshop upgrade to be obtained for free after a wave.
| Level
|
Value
|
Coins
|
Total Coins
|
|---|
| 1
|
0.50%
|
75
|
75
|
| 2
|
1.00%
|
118
|
193
|
| 3
|
1.50%
|
171
|
364
|
| 4
|
2.00%
|
236
|
600
|
| 5
|
2.50%
|
314
|
914
|
| 6
|
3.00%
|
407
|
1.32K
|
| 7
|
3.50%
|
515
|
1.84K
|
| 8
|
4.00%
|
639
|
2.48K
|
| 9
|
4.50%
|
781
|
3.26K
|
| 10
|
5.00%
|
941
|
4.20K
|
| 11
|
5.50%
|
1.12K
|
5.32K
|
| 12
|
6.00%
|
1.32K
|
6.63K
|
| 13
|
6.50%
|
1.53K
|
8.16K
|
| 14
|
7.00%
|
1.77K
|
9.93K
|
| 15
|
7.50%
|
2.03K
|
11.96K
|
| 16
|
8.00%
|
2.30K
|
14.26K
|
| 17
|
8.50%
|
2.60K
|
16.86K
|
| 18
|
9.00%
|
2.92K
|
19.79K
|
| 19
|
9.50%
|
3.27K
|
23.05K
|
| 20
|
10.00%
|
3.63K
|
26.69K
|
| 21
|
10.50%
|
4.02K
|
30.71K
|
| 22
|
11.00%
|
4.43K
|
35.14K
|
| 23
|
11.50%
|
4.87K
|
40.01K
|
| 24
|
12.00%
|
5.33K
|
45.34K
|
| 25
|
12.50%
|
5.81K
|
51.15K
|
| 26
|
13.00%
|
6.32K
|
57.47K
|
| 27
|
13.50%
|
6.85K
|
64.33K
|
| 28
|
14.00%
|
7.41K
|
71.74K
|
| 29
|
14.50%
|
8.00K
|
79.73K
|
| 30
|
15.00%
|
8.60K
|
88.34K
|
| 31
|
15.50%
|
9.24K
|
97.58K
|
| 32
|
16.00%
|
9.90K
|
107.48K
|
| 33
|
16.50%
|
10.59K
|
118.06K
|
| 34
|
17.00%
|
11.30K
|
129.36K
|
| 35
|
17.50%
|
12.04K
|
141.41K
|
| 36
|
18.00%
|
12.81K
|
154.22K
|
| 37
|
18.50%
|
13.61K
|
167.82K
|
| 38
|
19.00%
|
14.43K
|
182.25K
|
| 39
|
19.50%
|
15.28K
|
197.53K
|
| 40
|
20.00%
|
16.16K
|
213.69K
|
| 41
|
20.50%
|
17.07K
|
230.75K
|
| 42
|
21.00%
|
18.00K
|
248.75K
|
| 43
|
21.50%
|
18.96K
|
267.72K
|
| 44
|
22.00%
|
19.96K
|
287.67K
|
| 45
|
22.50%
|
20.98K
|
308.65K
|
| 46
|
23.00%
|
22.03K
|
330.68K
|
| 47
|
23.50%
|
23.11K
|
353.79K
|
| 48
|
24.00%
|
24.22K
|
378.01K
|
| 49
|
24.50%
|
25.36K
|
403.37K
|
| 50
|
25.00%
|
26.53K
|
429.90K
|
| 51
|
25.50%
|
28.56K
|
458.46K
|
| 52
|
26.00%
|
29.83K
|
488.29K
|
| 53
|
26.50%
|
31.13K
|
519.41K
|
| 54
|
27.00%
|
32.46K
|
551.87K
|
| 55
|
27.50%
|
33.82K
|
585.69K
|
| 56
|
28.00%
|
35.21K
|
620.90K
|
| 57
|
28.50%
|
36.64K
|
657.54K
|
| 58
|
29.00%
|
38.10K
|
695.63K
|
| 59
|
29.50%
|
39.59K
|
735.22K
|
| 60
|
30.00%
|
41.11K
|
776.33K
|
| 61
|
30.50%
|
42.67K
|
818.99K
|
| 62
|
31.00%
|
44.25K
|
863.25K
|
| 63
|
31.50%
|
45.88K
|
909.12K
|
| 64
|
32.00%
|
47.53K
|
956.66K
|
| 65
|
32.50%
|
49.22K
|
1.01M
|
| 66
|
33.00%
|
50.94K
|
1.06M
|
| 67
|
33.50%
|
52.70K
|
1.11M
|
| 68
|
34.00%
|
54.49K
|
1.16M
|
| 69
|
34.50%
|
56.31K
|
1.22M
|
| 70
|
35.00%
|
58.17K
|
1.28M
|
| 71
|
35.50%
|
60.06K
|
1.34M
|
| 72
|
36.00%
|
61.99K
|
1.40M
|
| 73
|
36.50%
|
63.95K
|
1.46M
|
| 74
|
37.00%
|
65.94K
|
1.53M
|
| 75
|
37.50%
|
67.97K
|
1.60M
|
| 76
|
38.00%
|
73.54K
|
1.67M
|
| 77
|
38.50%
|
75.75K
|
1.75M
|
| 78
|
39.00%
|
77.99K
|
1.83M
|
| 79
|
39.50%
|
80.27K
|
1.91M
|
| 80
|
40.00%
|
82.59K
|
1.99M
|
| 81
|
40.50%
|
84.94K
|
2.07M
|
| 82
|
41.00%
|
87.33K
|
2.16M
|
| 83
|
41.50%
|
89.76K
|
2.25M
|
| 84
|
42.00%
|
92.23K
|
2.34M
|
| 85
|
42.50%
|
94.74K
|
2.44M
|
| 86
|
43.00%
|
97.28K
|
2.53M
|
| 87
|
43.50%
|
99.86K
|
2.63M
|
| 88
|
44.00%
|
102.48K
|
2.74M
|
| 89
|
44.50%
|
105.14K
|
2.84M
|
| 90
|
45.00%
|
107.84K
|
2.95M
|
| 91
|
45.50%
|
110.57K
|
3.06M
|
| 92
|
46.00%
|
113.35K
|
3.17M
|
| 93
|
46.50%
|
116.16K
|
3.29M
|
| 94
|
47.00%
|
119.02K
|
3.41M
|
| 95
|
47.50%
|
121.91K
|
3.53M
|
| 96
|
48.00%
|
124.84K
|
3.66M
|
| 97
|
48.50%
|
127.81K
|
3.78M
|
| 98
|
49.00%
|
130.82K
|
3.91M
|
| 99
|
49.50%
|
133.87K
|
4.05M
|
Adds a chance for random Utility Workshop upgrade to be obtained for free after a wave.
| Level
|
Value
|
Coins
|
Total Coins
|
|---|
| 1
|
0.50%
|
100
|
100
|
| 2
|
1.00%
|
143
|
243
|
| 3
|
1.50%
|
196
|
439
|
| 4
|
2.00%
|
261
|
700
|
| 5
|
2.50%
|
339
|
1.04K
|
| 6
|
3.00%
|
432
|
1.47K
|
| 7
|
3.50%
|
540
|
2.01K
|
| 8
|
4.00%
|
664
|
2.68K
|
| 9
|
4.50%
|
806
|
3.48K
|
| 10
|
5.00%
|
966
|
4.45K
|
| 11
|
5.50%
|
1.14K
|
5.59K
|
| 12
|
6.00%
|
1.34K
|
6.93K
|
| 13
|
6.50%
|
1.56K
|
8.49K
|
| 14
|
7.00%
|
1.79K
|
10.28K
|
| 15
|
7.50%
|
2.05K
|
12.33K
|
| 16
|
8.00%
|
2.33K
|
14.66K
|
| 17
|
8.50%
|
2.63K
|
17.29K
|
| 18
|
9.00%
|
2.95K
|
20.24K
|
| 19
|
9.50%
|
3.29K
|
23.53K
|
| 20
|
10.00%
|
3.66K
|
27.19K
|
| 21
|
10.50%
|
4.05K
|
31.23K
|
| 22
|
11.00%
|
4.46K
|
35.69K
|
| 23
|
11.50%
|
4.89K
|
40.59K
|
| 24
|
12.00%
|
5.35K
|
45.94K
|
| 25
|
12.50%
|
5.84K
|
51.78K
|
| 26
|
13.00%
|
6.35K
|
58.12K
|
| 27
|
13.50%
|
6.88K
|
65.00K
|
| 28
|
14.00%
|
7.44K
|
72.44K
|
| 29
|
14.50%
|
8.02K
|
80.46K
|
| 30
|
15.00%
|
8.63K
|
89.09K
|
| 31
|
15.50%
|
9.26K
|
98.35K
|
| 32
|
16.00%
|
9.93K
|
108.28K
|
| 33
|
16.50%
|
10.61K
|
118.89K
|
| 34
|
17.00%
|
11.33K
|
130.21K
|
| 35
|
17.50%
|
12.07K
|
142.28K
|
| 36
|
18.00%
|
12.84K
|
155.12K
|
| 37
|
18.50%
|
13.63K
|
168.75K
|
| 38
|
19.00%
|
14.45K
|
183.20K
|
| 39
|
19.50%
|
15.30K
|
198.50K
|
| 40
|
20.00%
|
16.18K
|
214.69K
|
| 41
|
20.50%
|
17.09K
|
231.78K
|
| 42
|
21.00%
|
18.02K
|
249.80K
|
| 43
|
21.50%
|
18.99K
|
268.79K
|
| 44
|
22.00%
|
19.98K
|
288.77K
|
| 45
|
22.50%
|
21.00K
|
309.78K
|
| 46
|
23.00%
|
22.05K
|
331.83K
|
| 47
|
23.50%
|
23.14K
|
354.97K
|
| 48
|
24.00%
|
24.25K
|
379.21K
|
| 49
|
24.50%
|
25.38K
|
404.59K
|
| 50
|
25.00%
|
26.55K
|
431.15K
|
| 51
|
25.50%
|
28.59K
|
459.73K
|
| 52
|
26.00%
|
29.85K
|
489.59K
|
| 53
|
26.50%
|
31.15K
|
520.74K
|
| 54
|
27.00%
|
32.48K
|
553.22K
|
| 55
|
27.50%
|
33.84K
|
587.07K
|
| 56
|
28.00%
|
35.24K
|
622.30K
|
| 57
|
28.50%
|
36.66K
|
658.97K
|
| 58
|
29.00%
|
38.12K
|
697.09K
|
| 59
|
29.50%
|
39.61K
|
736.70K
|
| 60
|
30.00%
|
41.14K
|
777.84K
|
| 61
|
30.50%
|
42.69K
|
820.53K
|
| 62
|
31.00%
|
44.28K
|
864.81K
|
| 63
|
31.50%
|
45.90K
|
910.71K
|
| 64
|
32.00%
|
47.56K
|
958.27K
|
| 65
|
32.50%
|
49.25K
|
1.01M
|
| 66
|
33.00%
|
50.97K
|
1.06M
|
| 67
|
33.50%
|
52.72K
|
1.11M
|
| 68
|
34.00%
|
54.51K
|
1.17M
|
| 69
|
34.50%
|
56.34K
|
1.22M
|
| 70
|
35.00%
|
58.19K
|
1.28M
|
| 71
|
35.50%
|
60.09K
|
1.34M
|
| 72
|
36.00%
|
62.01K
|
1.40M
|
| 73
|
36.50%
|
63.97K
|
1.47M
|
| 74
|
37.00%
|
65.97K
|
1.53M
|
| 75
|
37.50%
|
68.00K
|
1.60M
|
| 76
|
38.00%
|
73.57K
|
1.67M
|
| 77
|
38.50%
|
75.77K
|
1.75M
|
| 78
|
39.00%
|
78.02K
|
1.83M
|
| 79
|
39.50%
|
80.30K
|
1.91M
|
| 80
|
40.00%
|
82.61K
|
1.99M
|
| 81
|
40.50%
|
84.97K
|
2.08M
|
| 82
|
41.00%
|
87.36K
|
2.16M
|
| 83
|
41.50%
|
89.79K
|
2.25M
|
| 84
|
42.00%
|
92.26K
|
2.34M
|
| 85
|
42.50%
|
94.76K
|
2.44M
|
| 86
|
43.00%
|
97.31K
|
2.54M
|
| 87
|
43.50%
|
99.89K
|
2.64M
|
| 88
|
44.00%
|
102.51K
|
2.74M
|
| 89
|
44.50%
|
105.17K
|
2.84M
|
| 90
|
45.00%
|
107.86K
|
2.95M
|
| 91
|
45.50%
|
110.60K
|
3.06M
|
| 92
|
46.00%
|
113.38K
|
3.18M
|
| 93
|
46.50%
|
116.19K
|
3.29M
|
| 94
|
47.00%
|
119.04K
|
3.41M
|
| 95
|
47.50%
|
121.94K
|
3.53M
|
| 96
|
48.00%
|
124.87K
|
3.66M
|
| 97
|
48.50%
|
127.84K
|
3.79M
|
| 98
|
49.00%
|
130.85K
|
3.92M
|
| 99
|
49.50%
|
133.90K
|
4.05M
|
TBA
The 
Free Upgrades card and free upgrade perk will increase all 3 free upgrade workshops by the listed value. The maximum free upgrade chance is 90.75%
