in Kingdom Rush are used to increase the power and effectiveness of towers and spells. There are six upgrade trees, one for each tower type and one for each spell. Each tree has a total of five upgrades.


Upgrades are bought with stars, which can be obtained in several ways:

  • Completing a Campaign level gives stars based on the number of lives left:
    • 18+ lives: 3 stars
    • 6-17 lives: 2 stars
    • 1-5 lives: 1 star
  • Completing a Heroic Challenge or Iron Challenge gives 1 star.
  • Exclusive to the Flash version:
    • Buying the Premium Content gives 15 stars.
    • Clicking on the Twitter and Facebook buttons gives 1 star each.
    • Trivia
    • You need to get 65 (62 stars on Flash) stars to buy every upgrade on all six trees in the original Kingdom Rush.

Kingdom RushEdit

Archer TowerEdit

  • KR Up Salvage Salvage (1 Star)
    • Marksmen Towers return 90% of value when sold. (Normally a rate of return is 60%.)
  • KR Up EagleEye Eagle Eye (1 Star)
    • Increases Marksmen attack range (by 10%).
  • KR Up PierSht Piercing Shots (2 Stars)
    • Piercing shots ignore a 10% of the enemy's physical armor.
  • KR Up FarShot Far Shots (2 Stars)
    • Increases marksmen attack range (by 10%).
  • KR Up Presc Precision (3 Stars)
    • Marksmen attacks have a chance of dealing double damage. (10%)


  • KR Up Tough Toughness Training (1 Star)
    • Barracks train soldiers with more health. (+10% health)
  • KR Up BetArmor Better Armor (1 Star)
    • Barracks train soldiers with improved armor. (+10% armor)
  • KR Up ImpDep Improved Deployment (2 Stars)
    • Improves rally point range (by 20%) and reduces soldier training time.
      • (Respawn time is reduced by 3 seconds for Holy Order, and by 2 seconds for the others.)
  • KR Up EndTrain Endurance Training (2 Stars)
    • Barracks train soldiers with even more health. (+20% health of the main one)
  • KR Up Spiked Spiked Armor (3 Stars)
    • When attacked, soldier's spiked armor return a 10% of the damage to the attacker. Spiked Armor also affects Reinforcements and Heroes. (dealt as True Damage)

Magic TowerEdit

  • KR Up SpellReach Spell Reach (1 Star)
    • Increases wizard's attack range (by 10%).
  • KR Up ArcShatt Arcane Shatter (1 Star)
    • Magic attacks destroy a potion of enemy physical armor on every hit.
  • KR Up Heremtic Hermetic Study (2 Stars)
    • Mage Towers construction and upgrading costs are reduced by 10%.
  • KR Up EmpMagic Empowered Magic (2 Stars)
    • Increases wizard's attack damage. (about 15%)
  • KR Up SlowCurse Slow Curse (3 Stars)
    • Magic attacks slow enemies by half their speed for a moment
      • (half a second, Arcane Wizard the whole one-second beam duration. Also disables Rocket Rider Turbo boost).


  • KR Up ConcFire Concentrated Fire (1 Star)
    • Increases artillery attack damage (10% damage increase).
  • KR Up Range Range Finder (1 Star)
    • Increases artillery attack range (by 10%).
  • KR Up FieldLog Field Logistic (2 Stars)
    • Artillery construction and upgrading costs are reduced by 10%.
  • KR Up Indust Industrialization (3 Stars)
    • Artillery special abilities costs are reduced by 25%.
  • KR Up SmartTar Smart Targeting (3 Stars)
    • Artillery suffers no reduction of splash and chain lightning damage.
      • (Means the damage is not reduced by distance from the center of explosion or between targets of Tesla x104 electric bolt.)

Rain of FireEdit

  • KR Up BlazSky Blazing Skies (1 Star)
    • Adds 2 additional meteors and increases meteor damage. In mobile, it has 5 meteors initially, but this upgrade increase damage of the meteors.
  • KR Up Scorch Scorched Earth (2 Stars)
    • Meteors set the ground on fire burning enemies over it for 5 seconds.
  • KR Up FastFur The Fast & Furious (3 Stars)
    • Increases meteor damage, explosion radius by 25% and reduces cooldown by 10 seconds.
  • KR Up BlazEarth Blazing Earth (3 Stars)
    • Doubles damage and duration of scorched earth, and reduces cooldown by 10 seconds.
  • KR Up Catac Cataclysm (3 Stars)
    • Increases meteor damage and rains 5 additional meteors at random locations all over the battlefield.


  • KR Up WellFed Well Fed (2 Stars)
    • Well Fed Farmers have additional health and deal a little more damage.
      • (50 HP, 1-3 damage)
  • KR Up Consc Conscripts (3 Stars)
    • Conscripts have more health and are better equipped.
      • (70 HP, 10% armor, 2-4 damage)
  • KR Up Warr Warriors (3 Stars)
    • Warriors have even more health and are excellently equipped.
      • (90 HP, 20% armor, 3-6 damage)
  • KR Up Legion Legionnaires (3 Stars)
    • Legionnaires have the most health and wear the best equipment.
      • (110 HP, 30% armor, 6-10 damage)
  • KR Up SprThrw Spear Throw (4 Stars)
    • Gives Legionnaires a spear throw attack that can target ground and flying enemies.
      • (110 HP, 30% armor, 6-10 damage, 24-40 ranged damage)

Kingdom Rush: FrontiersEdit

Archer TowerEdit

  • Up KRF ImpAim Steady Hand (1 Star)
    • Increases marksmen attack range (by 10%).
  • Up KRF Lumbermill Lumbermill (1 Star)
    • Reduces basic archer construction costs. (-10 gold for level 1-3 archer towers).
  • Up KRF FocusAim Focused Aim (2 Stars)
    •  Increases marksmen attack damage. (1-2 damage).
  • Up KRF Accuracy Accuracy (2 Stars)
    • Increases marksmen attack range (by 5%) and damage.
  • Up KRF TwinShot Twin Shot (3 Stars)
    • Marksmen have a chance of shooting two projectiles at the same time. (10%)


  • Up KRF Stance Defensive Stance (1 Star)
    • Barracks train soldiers with better armor. (+10% armor)
  • Up KRF BootCamp Boot Camp (1 Star)
    • Barracks train more resilient soldiers. [HP +10%]
  • Up KRF Espirt Esprit de Corps (2 Stars)
    • Increases barrack rally point range (+20%) and healing rate (+20% per second).
  • Up KRF Veteran Veteran Squad (2 Stars)
    • Soldiers are trained faster and with improved armor. (-2 seconds of respawn time, +10% armor of the main one)
  • Up KRF Courage Courage (3 Stars)
    • While in combat, soldiers, mercenaries & reinforcements regenerate 1% HP per second.

Magic TowerEdit

  • Up KRF Rune Rune of Power (1 Star)
    • Increases mages' attack range (by 10%).
  • Up KRF Penetration Spell Penetration (1 Star)
    • Mages' bolts have a chance to ignore magic resistance. (10%)
  • Up KRF Eldritch Eldritch Power (2 Stars)
    • Increases mages' attack damage (by 10%).
  • Up KRF Academy Wizard Academy (2 Stars)
    • Reduces mages' special abilities costs by 10%.
  • Up KRF Brilliance Brilliance (3 Stars)
    • For every mage tower built, each mage tower gets a bonus to damage (1, 1.05, 1.10, 1.14, 1.18, 1.21, 1.24, 1.27, 1.30)


  • Up KRF Smoothbore Smoothbore (1 Star)
    • Increases artillery attack range (by 10%).
  • Up KRF Powder Alchemical Powder (1 Star)
    • Artillery has a chance of dealing maximum damage with no splash reduction.
  • Up KRF Ordnance Improved Ordnance (2 Stars)
    • Increases artillery attack damage (by 10%).
  • Up KRF Gnomish Gnomish Tinkering (3 Stars)
    • Reduces artilleries' special abilities reload times.
  • Up KRF ShockAwe Shock and Awe (3 Stars)
    • Artillery towers have a 20% chance of stunning their targets for 2 seconds on every attack.

Rain of FireEdit

  • Up KRF Burning Burning Skies (2 Stars)
    • Increases meteor damage and reduces cooldown by 5 seconds.
  • Up KRF Scorched Scorched Earth (2 Stars)
    • Meteors set the ground on fire for 5 seconds, burning enemies walking over it.
  • Up KRF Hellfire Hellfire (3 Stars)
    • Adds 2 additional meteors and reduces cooldown by 5 seconds.
  • Up KRF Conflagration Conflagration (3 Stars)
    • Increases meteor damage and explosion radius (+25%) while doubling scorched earth effects.
  • Up KRF Cataclysm Cataclysm (3 Stars)
    • Increases meteor damage and rains 4 additional meteors at random locations all over the battlefield.

Reinforcements Edit

  • Up KRF Trained Trained Volunteers (2 Stars)
    • Trained Volunteers have additional health and deal a little more damage. (50 HP, 1-3 damage)
  • Up KRF MenatArms Men-at-Arms (3 Stars)
    • Men-at-Arms have more health and wear good armor. (70 HP, 10% armor, 2-4 damage)
  • Up KRF Champion Champion (3 Stars)
    • Champions have even more health and wield great weapons. (90 HP, 20% armor, 3-6 damage)
  • Up KRF Sworn Sworn Blades (3 Stars)
    • Sworn Blades have the most health and wield dual weapons. (110 HP, 30% armor, 6-10 damage)
  • Up KRF Recurve Recurve Bow (4 Stars)
    • Gives reinforcements a ranged weapon that can target ground and flying enemies. (110 HP, 30% armor, 6-10 damage, 16-30 ranged damage)

Kingdom Rush: OriginsEdit

Archer TowerEdit

  • KRO Upgrade A 01 Level-1 Master Shooter (1 star)
    • Increases Archer attack damage.
  • KRO Upgrade A 02 Level-2 Treesinged Bow (1 star)
    • Increases Archer attack range (by 10%).
  • KRO Upgrade A 03 Level-3 Obsidian Heads (2 stars)
    • Archers deal maximum damage against unarmored targets.
  • KRO Upgrade A 04 Level-4 Elven Training (2 stars)
    • Improves all Archer special abilities.
  • KRO Upgrade A 05 Level-5 Bloodletting Shot (3 stars)
    • Archer attacks have a 15% chance of causing heavy bleeding and dealing extra 10% of the damage made by the arrow.
Tower Maximum Bloodletting Damage
Hunter Arbor 23 (22 iOS)
Watcher Arbor 23 (22 iOS)
Sentinel Arbor 46 (44 iOS)
Arcane Archers 46 (44 iOS)
Golden Longbows Long-range shot: 161 (154 iOS)
Long-range shot combined with a "crit": 299 (286 iOS)
Short-range shot: 69 (66 iOS)
Short-range shot combined with a "crit": 115 (110 iOS)


  • KRO Upgrade B 01 Level-1 Elven Fencing (1 star)
    • Reduces basic barracks construction costs. (-10% for level 1-3 Barracks)
  • KRO Upgrade B 02 Level-2 Expert Tactician (1 star)
    • Increases barracks rally point range. (by 20%)
  • KRO Upgrade B 03 Level-3 Enchanted Armor (2 stars)
    • Barracks equip soldiers with improved armor. (+10%)
  • KRO Upgrade B 04 Level-4 Moon Forged Blades (2 stars)
    • Soldier attacks deal 15% additional magic damage.
Tower Damage without Upgrade (with Upgrade)
Defender Barracks 1-4 (3-5)
Warden Barracks 3-7 (5-9)
Ranger Barracks 8-12 (11-14)
Bladesinger Hall 11-14 (14-18)
Forest Keepers 24-36 (30-42)
  • KRO Upgrade B 05 Level-5 Blessing of Elynie (3 stars): Soldiers have a 10% chance of cheating death when dealt lethal damage. (Soldiers revive with full health when proced.)

Magic TowerEdit

  • KRO Upgrade M 01 Level-1 Crystal Focus (1 star)
    • Increases Mage attack range. (+5%)
  • KRO Upgrade M 02 Level-2 Empowered Magic (1 star)
    • Increases Mage attack damage. (+17.5%)
  • KRO Upgrade M 03 Level-3 Crystal Gazing (2 stars)
    • Increases Mage attack range (+5% from crystal focus)
  • KRO Upgrade M 04 Level-4 Unstable Magic (2 stars)
    • Mage attacks have a small chance of dealing triple damage.
      • (Each bolt gets 5% chance and it is shown as a "BLAST!".)
  • KRO Upgrade M 05 Level-5 Alter Reality (3 stars)
    • Mage attacks have a chance of teleporting enemies 20 node back down the path. (Wild Magus: 1%, High Elven Mage: 3%, the others: 10%)

Druid TowerEdit

  • KRO Upgrade D 01 Level-1 Hardened Boulders (1 star)
    • Increases Druid attack damage. (+10%)
  • KRO Upgrade D 02 Level-2 Sharp Splinters (1 star)
    • Increases boulder explosion area.
  • KRO Upgrade D 03 Level-3 Earth Mastery (2 stars)
    • Increases Druid attack range. (by 10%)
  • KRO Upgrade D 04 Level-4 Heavy Load (3 stars)
    • Boulder explosions ignore physical armor.
  • KRO Upgrade D 05 Level-5 Shocking Impact (3 stars)
    • Boulder explosions slow enemies for a short time. (by 50% for 0.5 second)


  • KRO Upgrade Th 01 Level-1 Thunderbolt (2 stars)
    • Adds 3 additional thunderbolts.
  • KRO Upgrade Th 02 Level-2 Roaring Gale (2 stars)
    • Increases thunderbolt damage and reduces cooldown by 10 seconds.
  • KRO Upgrade Th 03 Level-3 Thunderstorm (3 stars)
    • Adds 2 additional thunderbolts, while heavy winds slow down all enemies.
  • KRO Upgrade Th 04 Level-4 Monsoon (3 stars)
    • Increases thunderbolt damage and doubles wind slowing effect.
  • KRO Upgrade Th 05 Level-5 Furious Tempest (3 stars)
    • Increases thunderbolt damage and casts additional bolts at random enemies.


  • KRO Upgrade R 01 Level-1 Skilled Defenders (2 stars)
    • Skilled defenders have more health and better equipment.
      • (60 HP, 3-5 damage, 20% armor)
  • KRO Upgrade R 02 Level-2 Elven Stars (3 stars)
    • Gives reinforcements a ranged weapon that can target ground and flying enemies.
      • (60 HP, 20% armor, 3-5 damage, 7-10 ranged damage)
  • KRO Upgrade R 03 Level-3 Green Wardens (3 stars)
    • Green Wardens have more health, better armor and improved weapons
      • (100 HP, 35% armor, 5-10 damage, 10-20 ranged damage)
  • KRO Upgrade R 04 Level-4 Rapid Response (3 stars)
    • Reduces reinforcements cooldown by 5 seconds.
      • (From 15 seconds to 10 seconds.)
  • KRO Upgrade R 05 Level-5 Moon Sentinels (4 stars)
    • Moon sentinels are elite elven huntresses, riding giant panthers.
      • (150 HP, 50% armor, 10-15 damage, 20-30 ranged damage)

Kingdom Rush: VengeanceEdit

Upgrade PointsEdit

Upgrades in Kingdom Rush: Vengeance are bought with Upgrade Points instead of Stars and are gained differently to previous games. Unlike in previous games, upgrade points are exclusively earned from Campaign mode; completing Heroic and Iron Challenges give no upgrade points. The number of upgrade points earned is independent of stars; no matter how many lives the player finishes the stage with, the number of upgrade points is always the same. Most stages grant three upgrade points upon completion, with the exception of the following:


  • KRVUp Blitz BLITZ TACTICS (1 upgrade point): Increases the bonus gold for calling an early wave. (80% additional gold)
    • KRVUp Rations WAR RATIONS (1 upgrade point): With a full belly, Barracks units have improved health. (30% additional HP)
    • KRVUp GXR1 GXR-1 TARGETING SYSTEM (2 upgrade points): Improved with Goblin technology, Archery towers gain extra range. (5% additional range)
    • KRVUp Bombs BIGGER BOMBS (1 upgrade point): Infused with powerful alchemy, explosions now have a bigger range of effect. (20% additional area of effect)
    • KRVUp Runes RUNES OF POWER (2 upgrade points): All mage towers have a slight chance of dealing double damage on each attack. (10% chance of double damage)
  • KRVUp Guild GUILD OF MERCHANTS (2 upgrade points): Costs of towers' special skills is now reduced. (15% cost reduction)
    • KRVUp Master MASTER ARCHITECTS (2 upgrade points): All towers gain extra bonus damage. (10% additional basic attack damage)
    • KRVUp Coils DEATHRAY COILS (4 upgrade points): Replace the flags on each exit with deadly tesla coils that zap incoming enemies. These coils can zap enemies every 180 seconds for 150-300 true damage.


  • KRVUp Backto BACK TO BATTLE (1 upgrade point)
    • Reduces the respawn time of Heroes. (10% respawn reduction)
  • KRVUp Special SPECIAL TRAINING (1 upgrade point)
    • Thanks to a secret and intense training heroes level up faster. (25% extra XP gain)
  • KRVUp Oneman ONE MAN ARMY (2 upgrade points)
    • All heroes improve their base attack damage. (15% extra damage)
  • KRVUp Ultimate ULTIMATE POWER (1 upgrade point)
    • All heroes' Ultimate skills now have their cool downs reduced. (20% CD reduction)
  • KRVUp Will IRON WILL (2 upgrade points)
    • All heroes improve their maximum health. (20% HP increase)
  • KRVUp Shield SHIELD OF PROTECTION (2 upgrade points)
    • Every basic attack inflicted to a hero has a small chance of dealing no damage. (10% chance to trigger)
  • KRVUp SWind SECOND WIND (4 upgrade points)
    • Heroes now have a small chance of instantly respawning. (10% chance to trigger)

Demon GooniesEdit

  • KRVUp Infernal INFERNAL COMBUSTION (1 upgrade point): After dying, Goonies explode dealing area damage to all affected enemies.
  • KRVUp Trained TRAINED GOONIES (2 upgrade points): Better trained for combat, Goonies now have improved health and damage.
  • KRVUp Guards DEMON GUARDS (3 upgrade points): Goonies are now Demon Guards! They are capable of withstanding huge amounts of damage. Mutually exclusive with Hellion Tridents.
    • KRVUp Nova INFERNAL NOVA (2 upgrade points): Demon Guards now die with a bigger explosion. Deals extra damage and reaches more enemies.
  • KRVUp Hellion HELLION TRIDENTS (3 upgrade points): Goonies are now Hellon Tridents! They are demons that can hit their enemies with a ranged attack. Mutually exclusive with Demon Guards.
    • KRVUp Tridents FLAMING TRIDENTS (2 upgrade points): Hellion Tridents now throw burning tridents that burn enemies on impact for a brief duration.
  • KRVUp PitLord PIT LORD (6 upgrade points): When reinforcements are called to the battlefield, now there's a small chance of summoning a Pit Lord with them.

Soul ImpactEdit

  • KRVUp XImpact EXTRA IMPACTS (2 upgrade points): When the spells cast, adds an extra impact near the place the first one hit.
    • KRVUp SShock SOUL SHOCKWAVE (1 upgrade point): The impact now stuns the affected enemies for a brief duration.
  • KRVUp Call CALL OF THE DAMNED (3 upgrade points): After the impact, releases a bunch of spectres that chase and deal damage to enemies.
    • KRVUp XSpect EXTRA SPECTRES (2 upgrade points): Soul impacts now release additional spectres when they hit
    • KRVUp Fear FEAR OF THE DAMNED (1 upgrade point): Enemies hit by the spectres decrease their movement speed for a few seconds.
  • KRVUp Feast FEAST OF THE DAMNED (1 upgrade point): Each enemy killed by this spell reduces the cool down for the next cast.
  • KRVUp Echoes SOUL ECHOES (3 upgrade points): After the impact ends, there is a small chance of it striking again in the same place.
  • KRVUp Tornado TORNADO OF SOULS (5 upgrade points): When the spell is cast, extra impacts will fall across the battlefield.

See AlsoEdit

Upgrade Strategy

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