Challenges

Challenges

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Challenges are special game modes that varies in difficulty and conditions, such as, specific towers, limited upgrades, specific maps, and specific wave start and end.

There are two different challenges available to each player which are Simple and Advanced. Different challenges are available each day, which comes in an order. Completing a challenge will award you with various amount of experience and points, in which can be used to purchase skins for towers and level up. Challenges can be accessed at the left of the screen, between skins and contracts. Some challenges can be played with multiple people, and some challenges have modifiers or lock certain upgrades to make the gameplay spicier. All Tier 5 upgrades are locked, and a tower cannot be upgraded into a tier 5 upgrade if applicable.

If you want to know the current challenges, please go to the game.

Simple Challenges

Simple Challenges are easier challenges but gives low amount of experience and points. Most of them are played in Normal Mode and Hard Mode.

1. Autumn's Coming Your loadout. No other restrictions.

Waves 1-18

Map Autumn Cliffside

Rewards 2 80

Strategy This is probably the easiest challenge as you can do anything. You can actually use any tower you want and you'll probably win. But here is a strategy for players with only Slinger/only Sharp: Spam 0-0 Slingers then upgrade it to 0-2 afterwards. If you have Sharpshooter, place a 2-4 and a 4-0.

2. Bomb The Rest Slinger, Gunslinger, Demolitionist and Recon Base only. 1-X Slinger, 1-X Gunslinger and X-1 Recon Base upgrades are locked.

Waves All

Map Any

Rewards 2 50

Strategy The map Grassy Islands is recommended, Spam 2-0 recon bases, then upgrade them to 3-0 and everything should go smoothly.

3. Booster's Paradise (Multiplayer) Slinger and Bugler only. X-3 Slinger & 5-X Slinger paths are locked

Waves 1-17 (can't beat)

Map Thundercliff

Rewards 2 40

Strategy This challenge is barely possible on solo. It is recommended to join someone else who is queueing for a team.

4. Boss Incoming! Bugler, Sniper, Vulcan and Crossbower only. No other restrictions.

Waves 1-18

Map Seaside Shore

Rewards 2 40

Strategy Get 3-2 Crossbower, 2-3 & 2-4 Snipers. Then you can save for some Vulcans if you still have plenty of cash.

5. Cash Grab Market and Businessman only. X-4 upgrade for Businessman is locked.

Waves 1-19

Map Grassy Islands

Rewards 2 30

Strategy Market is unnecessary in this challenge. Spam 2-0 Businessmen one by one until the max placement limit then upgrade them to 4-2 afterwards.

6. Close Chaos Techblade, Gunslinger and Freezer only. No other restrictions.

Waves All

Map Dragon's Keep

Rewards 3 50

Strategy (This challenge is currently outdated) Spam 4-2 Gunslingers

7. Air Defenders Sniper, Businessman and Sharpshooter only. 3-X upgrade for Businessman is locked.

Waves All

Map Grassy Islands

Rewards 3 50

Strategy Turn autoskip on for the rest of the game. Place a 2-4 Sharpshooter and spam 4-0 Sharpshooters. Other version: Spam 2-0 Businessmen until max placement, then place 2-4 Snipers.

8. Late Start Your loadout. No other restrictions.

Waves 10-15

Map Canyon Crossing

Rewards 2 40

Strategy Place A 2-4 Sharpshooter under the bridge where the enemy path is/2 paths crossover eac hother. Then place 2 3-0 Sharpshooters near the 2-4 Sharpshooter

9. Lack of Upgrades Your loadout. 3-X and X-3 upgrades is locked for all towers.(light beamer, surveyor, businessman are excluded)

Waves 1-20

Map Any

Rewards 2 50

Strategy Spammable towers that are already good without the third upgrade such as Gunslinger can be effective in this challenge. A Bugler is recommended if you have.

10. Nuclear Doomsday Demolitionist and Businessman only. 3-X upgrade for Demolitionist and Bottom path upgrade for Businessman are locked.

Waves 15-20

Map Faction Central

Rewards 4 80

Strategy Lock Auto-Skip ON For Faster Match. Spam 2-4 Demolitionists. Use the ability on Voltmaster. Use the Abillity on any remaining enemies after Voltmaster is dead

11. Pure Opposites Gunslinger and Sniper only. No other restrictions.

Waves 1-21

Map Barren Desert

Rewards 3 50

Strategy Place 4 1-0 Snipers, then upgrade them to 2-4 one by one.

12. Path 1 Only Your loadout. Bottom path for every tower is locked. (Currently both path for Surveyor works.)

Waves 1-28

Map Any

Rewards 2 40

Strategy Use towers that are effective at Path 1 such as Sharpshooter.

13. Path 2 Only Your Loadout Top path for every tower is locked.

Waves 1-29 (can't beat)

Map Any

Rewards 2 40

Strategy Use towers that are effective at Path 2 such as Slinger or Vulcan.

14. Projectile Only Slinger, Crossbower and Demolitionist only. Bottom path and 2-X upgrade for Crossbower is locked.

Waves 1-18

Map Any

Rewards 2 50

Strategy The map Grassy Islands is recommended. Spam 2-3 Crossbowers at the straight paths and set its target to last, upgrade them to 2-4 afterwards. (Do NOT enable auto skip during the challenge and you will very likely have some leaks but it will be fine as your base can tank it.)

15. Sling Them Slinger only. You'll receive 600 base health.

Waves 1-15

Map Any

Rewards 2 50

Strategy Grassy Islands is recommended, but many other maps work fine too. Put 12 0-0 Slingers then upgrade them to 0-2, upgrade 3 of them to 2-3 and 3 of them to 3-2 afterwards.

16. Sharpy Snipes Sniper and Sharpshooter only. No other restrictions.

Waves 1-24

Map Grassy Islands

Rewards 2 50

Strategy Place a 2-4 Sharpshooter, then spam 2-4 Snipers.

17. Tundra Hunt 1.000 starting cash, 100 starting health. Crossbower, Sniper and Freezer only. No other restrictions.

Waves 4-25

Map Snowy Avenue

Rewards 3 60

Strategy Place a 3-2 Crossbower for starting. Then place a 2-3 Sniper. Afterwards, place a 4-X Freezer, Try to maximise it's range and keep in mind that the freezer gets a huge range boost at 3-X. Getting 4-X Freezer will stunlock most enemies. Then, upgrade your 2-3 Sniper into 2-4 and keep spamming 2-4 Snipers until you win.

18. Underdogs Slinger Crossbower Freezer and Gunslinger. No other restrictions.

Waves 1-17

Map Any

Rewards 2 50

Strategy Choose an easy map like Grassy Island or Mystical Shore. 4 Gunslingers at the start with one 0-0 Freezer (optional) A 3-X Crossbower, 4-2 Slingers for Wingeds and more 4-2 Crossbowers

After Underdogs, the Simple Challenge cycle returns to Autumn's Coming.

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Advanced Challenges

Advanced challenges are harder challenges that gives more rewards. Most of them are played in Normal Mode and Expert Mode. Completing 4 different ones will unlock the Elite tower.

1. Unseen Threat Crossbower, Demolitionist, Sniper and Trapper only. Bottom path for Crossbower is locked.

Waves 1-24

Map Mythical Shore

Rewards 5 100

Strategy Turn on auto skip until wave 7, place a 2-2 Demolitionist at the first C-curve, then, place a 2-3 Sniper at the third C-curve near the tree, after that, upgrade the Demolitionist to 2-3, use the ability on Berserker as soon as it comes out and use the ability on him again as soon as the cooldown is off, upgrade the Sniper to 2-4 afterwards, after that, get another 2-3 Demolitionist, then get another 2-4 Sniper near the first one, use the Demolitionist's ability on the Raygunners as soon as they were about to reach the middle of the first C-Curve, then use the ability again on the last two Sprinter M5s and you will win eventually.

2. Freezeflame Sharpshooter and Freezer only. 3-X upgrade for Sharpshooter is locked.

Waves 4-27 (20)

Map Snowy Avenue

Rewards 5 100

Strategy Freezer is unnecessary for this challenge, keep auto-skip off as soon as you entered the challenge, place 4 1-0 Sharpshooters and upgrade 2 of them to 1-4, spam 1-0 Sharpshooters afterwards.

3. Hard Fought Vulcan, Gunslinger, Market and Sniper only. You can only place 18 towers. You'll receive 500 base health.

Waves All

Map Seaside Shore

Rewards 5 80

Strategy Turn auto skip on at the start of the game. Place a Vulcan at the curve and upgrade it to 0-3 > 2-3 > 2-4 (don't need to place other towers since you got 500 base health and it is hard to lose). Then, place another Vulcan at the curve and upgrade it to 0-3 > 2-3.

4. Heated Battle Sharpshooter and Electricizer only. 3-X upgrade for Sharpshooter and X-3 upgrade for Electricizer are locked.

Waves 5-27

Map Molten Cliffs

Rewards 5 125

Strategy Turn auto skip on at the start of the game. It is recommended to place the towers at the curve. Place a 2-4 Sharpshooter in the middle of the map. Place another 2-4 Sharpshooter in one of the entrance. Place another 2-4 Sharpshooter in the opposite side of the entrance. Place three 2-2 Electricizers one by one in the middle of the map. Upgrade those Electricizers to 3-2. Once all other enemies are cleared. sell your Electricizers and Sharpshooters that are out of range of the Apparition. Depending on where the apparition is going, spam 2-4 sharpshooters over at that entrance.

5. Pink Duplicate Your loadout. 5-X, X-5 Recon Base is locked. You'll receive 1000 base health.

Waves 30-34

Map Crystal Mines

Rewards 10 250

Strategy Placing three 4-X Recon Base supported by six 3-X Businessman is sufficient enough.

6. Preparation Vulcan, Electricizer and Market only. You'll receive 1400 base health. No other restrictions.

Waves All

Map White Forest

Rewards 5 80

Strategy Skip every wave until you have placed a Vulcan. Upgrade the Vulcan to 2-3 and proceed to place more afterwards. You do not need Electricizer or Market in this challenge.

7. Road Rage Demolitionist, Vulcan, Bugler, Sharpshooter and Electricizer only. 3-X upgrade for Electricizer and Sharpshooter is locked. Third upgrade on both paths for Bugler is locked. Ranked Up modifier is applied. $6,000 starting cash. 500 Base HP. +50% economy

Waves 13-27

Map Roundabout

Rewards 8 200

Strategy Place a 0-4 Sharpshooter and skip the wave to upgrade it to 2-4. Place three 4-0 Vulcans one by one. On wave 24, place another 2-4 Sharpshooter. After that, place two more 4-0 Vulcans.

8. Seaside Shakedown Elite and Crossbower only. 4-X upgrade for Elite is locked. Ranked Up modifier is applied.

Waves 0-23

Map Seaside Shore

Rewards 3 60

Strategy Place 1 3-X crossbower, then place 3 3-1 elites (when shielders come get them 3-2) Then upgrade 3-X crossbower to 4-2 And get 2 more 4-2 crossbowers. Then get 3 3-2 elites and the rest should just be smooth sailing.

9. Shooting 'Ranged' Gunslinger, Trapper, Techblade and Freezer only. You'll recieve 420 base health. No other restrictions.

Waves All

Map White Forest

Rewards 5 100

Strategy Place lots of 0-0 Gunslingers at the start and proceed to upgrade them to 4-2. A 4-2 Freezer is also advised to be used. Alternatively, a 4-0 Cyberblade can be used as early game as well.

10. Space Warfare 60,000 starting cash. You'll receive 500 base health. Elite, Bugler and Electricizer only. No other restrictions.

Waves 20-36

Map Interstellar Defense

Rewards 8 225

Strategy Don't use any skins for elite besides the default one (the night raider skin is bugged). Place 4 2-3 Electrizers. Then, place 1 3-2 elite. Place a 2-2 bugler. Place another 4 2-3 electrizers (place them behind the first ones to avoid them targeting only one enemy/syncing). Upgrade bugler to 4-2 (use drums at soon as wave 29 starts). Spam 0-4 elites (don't use the ovecharge ability until wave 30, and keep on using drums when it's ready after wave 29). Use the overcharge ability on the engineer twice and the carrier thanks once their shield health deplets. Keep on spamming 0-4 elites and spam the abilty on boltmaster. You may micro them (placing, upgraeing, using ability, seliing, repeat) however this is unnesesary since spamming is easier and more effective.

11. Bring The Special Ops 3000 starting cash. Recon Base and Elite only. No other restrictions.

Waves 5-27

Map Sky Islands

Rewards 8 175

Strategy Place a 3-1 Elite (Upgrade it to 3-2 once the first Gargantuan X spawns) place a 2-4 recon base, after doing so place another 3-2 elite as soon as possible, then place another 2-4 recon base and the rest will be smooth sailing. (Optional: Place 3 3-2 Elites at the start to kill the Apparition Faster)

12. Team Supporters Bugler, Slinger, Freezer and Market. No other restrictions.

Waves 5-26

Map Crystal Mines

Rewards 5 125

Strategy Get 2-2 Slingers covering the middle S-curve for the entire game. In the (unlikely) event that Voltmaster leaks, quickly sell and replace Slingers toward the rear curve.

13. The Trio Your loadout. You can ONLY place 3 towers.

Waves 1-27

Map Sky Islands

Rewards 5 125

Strategy Place a Sharpshooter on the loop, covering the path and upgrade it to 2-4. Place two 4-0 Sharpshooters one by one. On Wave 27, sell all Sharpshooters and place 4-0 Sharpshooters at the end to kill the Sprinter M5.

14. Far Far West Sniper and Sharpshooter only. 4-X and Bottom path upgrades for Sharpshooter is locked.

Waves 19-26

Map Canyon Crossing

Rewards 8 150

Strategy Spam 2-4 Snipers in the center bridge.

15. Ability Force Bugler, Elite, Demolitionist, Gunslinger and Businessman only. You can only place 20 towers.

Waves 1-33

Map Sky Islands

Rewards 5 100

Strategy Skip Wave 1 for Elite and place it at the center of the loop, behind the rock, to cover the path. Upgrade it to 4-2 and repeat with another Elite. Spam 4-2 Demolitionists at the center, in front of the rock. 2-4 Elite is optional.

16. Crystal Rush Sharpshooter and Crossbower only. 4-X and bottom path upgrades for both towers are locked.

Waves 1-26

Map Crystal Mines

Rewards 6 100

Strategy Get a 1-3 sharpshooter at the S-curve, and get 2-4 once the winged arrives. From then on, spam 3-0 sharpshooters.

17. Underdogs Trapper and Vulcan only. No other restrictions. Note: This challenge is currently bugged that the Trappers place at the edges of the road.

Waves All

Map Snowy Avenue

Rewards 2 100

Strategy Keep Auto-Skip on. Place a Vulcan at the end of the path and upgrade it to 3-2. Then turn auto skip off. Then place as many 2-3 Vulcans at the entrance as you can.

18. Beginning Of The End (Multiplayer) Electricizer, Sharpshooter, Bugler, Vulcan and Recon Base only. Hardcore Modifier enabled. This challenge can be played with other players. Tier 5 upgrades for Recon Base and Electricizer is locked.

Waves 37-40

Map Sky Islands

Rewards 8 200

Strategy This challenge is easy to solo. Place three 4-2 Recon Base at the back and place six 4-2 Electricizers. Place two 2-4 Electricizers then place a 4-2 and a 2-4 Bugler. On the loop, spam 2-4 Vulcans. It is recommended to chain Snare Drums.

19. Explosive Business (Multiplayer) Market, Businessman, Demolitionist and Gunslinger only. 3-X upgrade for Gunslinger is locked.

Waves 1-28

Map Crystal Mines

Rewards 6 150

Strategy You can do this alone by putting 6 2-0 Businessmen, upgrade 2 of them to 2-2 then DURING THIS IT'S VERY IMPORTANT upgrade 1 or 2 Businessmen to 2-3 when flying come. Put a 2-4 Gunslinger for Gargantuan X. Upgrade the rest of the Businessmen to 4-2, and then spam 2-4, Demolitionists, and use the abilities on tough enemies, mainly the Saber Champion on the final wave.

20. The Weak vs the Strong Slinger, Crossbower and Freezer only. No other restrictions.

Waves 1-16

Map White Forest

Rewards 5 80

Strategy Keep auto skip on. Spam 4-2 Crossbowers.

21. Faster And Stronger Sharpshooter, Demolitionist and Bugler only. 4-X upgrade for Sharpshooter is locked. Ranked Up Modifier is enabled.

Waves 1-14

Map Any

Rewards 7 150

Strategy Grassy Islands is recommended. Get 1 1-2 Sharpshooter at the first C-curve, upgrade it to 1-4 after that, get 1 3-0 Sharpshooter next to the 1-4 Sharpshooter and place 2 3-0 Sharpshooters at the 2nd and 3rd C-curves, when the Cursed Fires from wave 14 starts to get past the 2 Sharpshooters of the 1st and 2nd curve, sell the Sharpshooter of the 2nd curve and put 1 3-0 Sharpshooter and a 0-0 Sharpshooter at the 3rd curve near the first one, the point of doing this is to minimize the damage of the Cursed Fire to the base. (In the end, you should have 1 1-4 and 1 3-0 Sharpshooters at the 1st C-curve, 0 Sharpshooters at the 2nd C-curve, and 2 3-0 and 1 2-0 Sharpshooters at the 3rd C-curve. )

After Faster And Stronger, the Advanced Challenge cycle returns to Unseen Threat.

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Tier 5 Challenges

Tier 5 challenges are special challenges that unlocks the 5th upgrade for Towers. It will be playable once you finished all quests in the current category.

As of 30/03/25, Recon Base, Electricizer and Lightbeamer are the only towers with tier 5 challenges.

Recon Base:

Budget Recon Businessman and Recon Base only. 2-X Businessman is locked. 50 starting base HP.

Waves 4-18

Map Airway

Rewards Alien Warfare

Strategy Keep auto skip on until wave 10. Get three 1-1 businessmen. Spread them across the map and make sure their range is just touching one another. Get a 2-0 recon base. TIP: Get 1-X before setting it's spawning to automatic. Upgrade the businessmen to 1-3, starting with the first one you placed to the last. Upgrade the recon to 3-0, then 3-2.

Overload Mechanic, Elite and Recon Base only. 3-X upgrade for Recon Base is locked and Hardcore Modifier is applied.

Waves 20-30

Map Interstellar Defense

Rewards Bliss of Finality

Strategy Get a 2-4 Recon Base, a 0-4 Mechanic, another 2-4 Recon Base, and spam 0-4 Elite abilities on the Carrier Tank.

Electricizer:

One in the Chamber Electricizer only. Jetpackers and UFOs don't have flying. Boltmaster has 20,000 Health. Hardcore modifier enabled.

Waves 26-36

Map Classic Isle

Rewards Starship Killer

Strategy Place 8 2-2 Electricizers at the small island close to the base, upgrade 5 of them to 2-3 and 3 of them to 3-2 afterwards, during wave 31, when the second Carrier Tank reaches the second loop (It's health should be around 1000 at that point), skip the wave instantly and get a fourth 2-3 Electricizers so that if the Carrier Tank spawned an Elite Drone there will still be enough time to kill it before it enters your base, after getting 5 2-3 Electricizers and 3 3-2 Electricizers, upgrade the 2-3 Electricizers to 2-4 whenever you have enough cash, the rest of the challenge should be easy to complete. (Do NOT turn on Auto Skip)

Electrolysis Electricizer only. Jetpackers don't have flying. Snowstorm modifier enabled.

Waves 19

Map White Forest

Rewards Voltage Overdrive

Strategy Place 3 Electricizers at the area where it can cover most of the path. And then you can spend rest of the income to upgrade Electricizers to 0-1, or move your Electricizers to better location. Make sure to spam click the frozen towers to un-stun them. Currently there's a glitch that causes the unfrozen towers to keep the ice block visual on them permanently. If one towers does not attack for a very long time and shaking at the same moment, that means the tower is currently frozen.

Lightbeamer:

Blinding Light Lightbeamer and Crossbower only. 3-X Crossbower is locked.

Waves 3-19

Map Sky Islands

Rewards The Prototype

Strategy Important: check this video for placement reference. Place a 0-0 Lightbeamer and Crossbower. Upgrade both towers to 0-2 alternating between the towers. Upgrade Crossbower to 1-3. Skip waves 12, 13, and 14 then sell Crossbower to quickly upgrade Lightbeamer to 0-3. Place a 1-3 and a 0-0 Crossbower at the back (do it fast). Afterwards, get another 0-3 Crossbower (sell the 0-0 Crossbowerfor extra cash). Sell the 1-3 Crossbower to afford a 3-1 Lightbeamer. When Berserker comes around, you can sell the final 1-3 Crossbower to get the 3-1 Lightbeamer to 3-2. Tip: set the 1-3 Crossbower at step 5 to strong targeting. (May take a few tries)

Trivia

• Electcrolysis is currently the shortest challenge, with only one wave, beating Beginning of the End, which was originally the shortest with 4 Waves.
  • If not counting Tier 5 Challenges, Beginning of the End is still the shortest.
• Beating 4 different advanced challenges reward you the Elite tower, and the Elite Defender badge.
  • You will have Elite in some preset challenge loadouts, and you will be able to test the tower.
  • Even Businessman and Recon Base can be tested in some challenges, which are towers that are hard to get.
• Challenges were introduced at the Blissful Revelations (Overhaul) update.
• Seaside Shakedown is the first challenge to have a modifier applied, the second being Road Rage.
• Boss Incoming is the only simple challenge with Expert difficulty.
• The first ever known challenge was "Boss Rush" with easy difficulty (Now Normal) with 10 waves, it was leaked in Tower Blitz discord, however this challenge was removed in an unknown date.
• Challenges formerly gave Tokens before Points.
• The Underdogs Simple and Advanced challenge gives the lowest amount of points, with only being 2.
  • They both are also the only challenges to share the same name.
• Ignitus is the only final boss who does not appear in challenges, while Overlord only appears once as seen in Beginning of the End.
  • Due to the number of waves being lowered in Cold Construct 2022, Ignitus unintentionally appears in Heated Battle and Crystal Rush.
  • Though due to a bug, Overlord no longer appears in Beginning of the End.
• During Dragon's Keep's archiving, the only way to play on this map is to do the Close Chaos Challenge.
• Surveyor can bypass upgrade restrictions. This is most likely an oversight.
  • Businessman can also be upgraded to 4-2 in Lack of Upgrades.
• Blinding Light used to take place in Hard Mode and had Fundless modifier, but it was changed due to being impossible.
• One in the Chamber and Electrolysis are currently the only two challenges to change enemies' stats rather than using modifiers.
• During an update in February 2025, Expert Mode was reverted from its 40-wave structure to its original 50-wave structure.
  • This broke many challenges that took place in Expert, making them significantly easier.
  • A well-known example is Beginning of the End, which originally put the player(s) against The Corrupted and Overlord during the final waves 37-40.
    • However, as the 50-wave structure returned, it meant that the mentioned bosses returned to waves 47-50, and the player(s) now fought against Robotic Overseer instead, which made the challenge extremely easy.