Modifiers

Modifiers can be placed on platform tiles instead of towers. They affect the surrounding 8 tiles with various beneficial effects, though often with certain trade-offs as well. They're also more economically flexible than towers, being sellable for greater percentages of their original costs than towers generally are - they can be sold for their full price 5 minutes after placing them. If sold earlier, they will return 75% of the coins.

Modifiers can be unlocked most commonly via Research, where upgrades to the quantity and quality of each can be purchased; and less commonly via specific Trophies.

Modifier price increases for each matching modifier already in play, with compounding cost increases that vary by type (details for each type are provided below).

Modifiers Available

Balance

Evenly distributes experience between surrounding towers Increases surrounding towers max XP level by 1 for each level of the modifier Doesn't diminish experience if this leads to a decrease of tower's level Rate of xp transfer per second increases with level (at a cost of xp)

Prices:

The initial cost is 25, and it grows at a rate of about 1.4 times.

Mod#	1	2	3	4	5	6	7	8	9	10	11	12
Cost	25	35	50	70	95	135	190	265	370	520	720	1010

Transfer Rates and Upgrade Costs:

Upgrade Level	XP/sec	Next Lvl XP cost @base, @max res.
1	3	100	90
2	7	300	270
3	15	1000	900
4	35	2500	2250
5	100	N/A	N/A

Search

With SEARCH, surrounding towers will constantly search for new enemies, even if their current target is still alive Increases tower range by 6% (upgradable to 7% in Normal and 11% in Endless)

Prices:

The initial cost is 25, and it grows at a rate of about 1.4 times.

Mod#	1	2	3	4	5	6	7	8	9	10
Cost	50	70	95	135	190	270	375	530	740	1030

Power

Gives +5% PWR (upgradable to 8% in Normal and 28% in Endless, with +1.2% more available in Star Research) to all nearby towers Consumes 1 XP/s of the most experienced tower for bonus of each tower. Doesn't diminish experience if this leads to a decrease of tower's level Effect is multiplied by Power platform bonus PWR increases all common (non-gold) characteristics except range

Prices:

The initial cost is 100, and it grows at a rate of about 1.5 times.

Mod#	1	2	3	4	5	6	7	8	9	10	11	12	13	14
Cost	100	150	225	335	510	760	1140	1710	2560	3840	5750	8650	12950	19450

Damage

Increases damage of towers on the sides by 15% (upgradable to 21% in Normal and 53% in Endless) Decreases attack speed of towers on the corners by 5%

Prices:

The initial cost is 100, and it grows at a rate of about 1.5 times.

Mod#	1	2	3	4	5	6	7	8	9	10
Cost	100	150	225	335	510	760	1140	1710	2560	3840

Attack Speed

Increases attack speed of towers on the sides by 15% (upgradable to 21% in Normal and 54% in Endless, with +1.5% more available in Star Research and 1% more in Trophies) Decreases damage of towers on the corners by 5%

Prices:

The initial cost is 100, and it grows at a rate of about 1.5 times.

Mod#	1	2	3	4	5	6	7	8	9	10
Cost	100	150	225	335	510	760	1140	1710	2560	3840

Mining Speed

Gives +35% (upgradable to 60% in Normal and 220% in Endless, with +6% more available in Star Research) to the mining speed of nearby miners Reduces Rotation and Projectile speed of nearby towers by 5% The more modifier are connected to a miner, the less effective each of them becomes

Prices:

The initial cost is 120, and it grows at a rate of about 1.64 times.

Cost Formula:$Cost\approx 120\times 1.6^{(Count-1)\times 1.05}$

Mod#	1	2	3	4	5	6	7	8	9	10	11	12
Cost	120	195	320	530	860	1420	2320	3800	6200	10200	16700	27350

Efficiency of each next modifier:

Mod#	1	2	3	4	5	6	7	8
Efficiency	100%	55%	45%	40%	36%	34%	32%	30%

Bounty

Gives bonus 2% of player's current coins, but not more than 50 coins (upgradable to 60 coins in Normal and 100 coins in Endless, with +5 coins more available in Star Research), each time an enemy wave is completely defeated. Surrounding towers don't gain coins for killed enemies Cost also increases with map difficulty See Bounty tactics for details on costs and optimal purchase points

Minimum Prices (≤100% difficulty):

Mod#	1	2	3	4	5	6	7	8	9	10	11	12
Cost	180	310	530	910	1560	2690	4610	7900	13600	23350	40050	68750

Experience

When a resource is mined by a neighbouring miner, shares 15 XP (upgradable to 21XP in Normal and 45XP in Endless, with +2XP more available in Star Research) between surrounding towers Takes 1 cheapest resource from each neighbouring miner every 10 seconds

Prices:

The initial cost is 100, and it grows at a rate of about 1.5 times.

Mod#	1	2	3	4	5	6	7	8	9	10	11	12
Cost	100	150	225	335	510	760	1140	1710	2560	3840	5750	8650