Mystery

Mystery

ARTICLE

ADVANCED STATS

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This article is about Mystery. You may be looking for other Mystery enemies.

Mystery
Mode Appearance	Legacy Molten Golden Legacy Fallen Hardcore Challenges Legion Juggernaut
Wave Debut	17 (Hardcore) 16 (Legacy Molten, Golden & Legacy Fallen) 9 (The Heights)
Statistics
Base Health	20 (Hardcore) 10 (Sandbox) Challenges 12 (Juggernaut)
Speed	Above Average (4)
Cash Given	$5 on death
Spawned By	Grave Digger (Legacy version, Hardcore only) Mystery Summoner (Formerly) Summoner Boss Necromancer Boss Void Reaver
Hidden?	No
Flying?	No
Ghost?	No
Lead?	No
Attributes	None
Ability
Ability	Spawn - Upon death, spawns into a random enemy depending on the mode and wave.

• Current
• Translated
• April Fools 2022
• Version 1

"Still alive???
Incoming mysterious enemies!"

―Beginning of Wave 16 (Golden)

"Here come mystery zombies!
They'll turn into a random enemy when killed! I wonder what's inside them?"

―Commander dialogue on Wave 16 (Formerly, Legacy Molten)
Commander dialogue on Wave 11 (Formerly Normal)

"Here come mystery enemies!
They'll turn into a random enemy when killed! I wonder what's inside them?"

―Commander dialogue on Wave 16 (Legacy Fallen)

"Here come mystery enemies!
They'll turn into a random enemy when killed, I wonder what's inside them?"

―Commander dialogue on Wave 17 (Hardcore)

"He died miraculously!
When they die, they turn into zombies! what they have"

―Commander dialogue on Wave 16 (Translated Molten
Commander dialogue on Wave 11 (Formerly Translated Normal)
(Translated Molten)

"Here you can kill enemies.
When they die, they become enemies. friendly game"

―Commander dialogue on Wave 16 (Translated Fallen)
Commander dialogue on Wave 17 (Translated Hardcore)

"Hewe come mystewy zombies! (☉_☉)
They'ww tuwn into a diffewent zombie when kiwwed! I wondew what's inside them?"

―Commander dialogue on Wave 11 (April Fools 2022 Normal)

"Hewe come mystewy zombies! .⁰(☒д☒ₒ )⁰.
They'ww tuwn into a diffewent zombie when kiwwed! I wondew what's inside them?"

―Commander dialogue on Wave 16 (April Fools 2022 Molten)

"Hewe come mystewy enemies! ε=ε=(っ*´□`)っ
They'ww tuwn into a wandom enemy when kiwwed! I wondew what's inside them? "

―Commander dialogue on Wave 16 (April Fools 2022 Fallen)

"Hewe come mystewy enemies! ε=ε=(っ*´□`)っ
TThey'ww tuwn into a wandom enemy when kiwwed, I wondew what's inside them? "

―Commander dialogue on Wave 17 (April Fools 2022 Hardcore)

"Still alive???
Incoming mysterious enemies!"

―Beginning of Wave 11 (Pre-Overhaul, Beginner's)
Beginning of Wave 16 (Pre-Overhaul, Molten, Golden & Fallen)

Description

The Mystery is a fast, weak enemy that spawns another enemy upon its death. The enemy spawned depends on mode and wave, making the Mystery a potentially very dangerous enemy, especially if the player is unlucky and comes unprepared.

This appears in Hardcore mode, and in some Sandbox mode exclusive modes, these being Legacy Molten mode, Legacy Fallen mode and Golden mode. They also appeared in The Heights during the SFOTH Event.

The Mystery can be spawned by the Grave Digger (Hardcore only), Mystery Summoner, Summoner Boss, Necromancer Boss and Void Reaver. If the Enemies Beta modifier is active, these enemies will instead spawn the Breaker2.

The Mystery is replaced by the Breaker2 in any map with the Enemies Beta modifier active.

Appearance

• Current
• Enemies Beta
• Version 3
• Version 2
• Version 1

The Mystery is a translucent glass green humanoid with a glowing orange question mark on its torso. It is faceless and small green question marks are emitted from its torso when it is killed.

The Enemies Beta version of the Mystery had a pastel light green skin color, with its torso and legs being a darker shade of green with a plaid stitch mark pattern on them. It also had a desaturated yellowish-orange question mark on its chest.

The third version of the Mystery is similar to the current version, except it had a drooling zombie face and did not emit green question marks upon death.

The second version of the Mystery is similar to the third version, except it was more translucent, and its skin color was a lighter shade of green. Its question mark did not glow either and had a vibrant orange color.

The first version of the Mystery is similar to the second version, except it was blue.

Enemy Spawned

The Mystery is able to spawn more enemies after its debut. Italic names can be spawned from the Mystery's debut.

Easy

Only visible through Sandbox mode.

• Normal
• Speedy (from wave 4)
• Slow (from wave 6)
• Normal Boss (from wave 8)
• Hidden (from wave 10)
• Bolt (from wave 20)

Legacy Molten

• Normal
• Speedy (from wave 6)
• Slow (from wave 8)
• Normal Boss (from wave 11)
• Hidden (from wave 14)
• Molten (from wave 21)
• Shock (from wave 27)

Golden

• Abnormal
• Quick (from wave 6)
• Heavy (from wave 8)
• Abnormal Boss (from wave 11)
• Shadow (from wave 14)
• Golden (from wave 21)
• Charge (from wave 27)

Legacy Fallen

• Abnormal
• Quick (from wave 6)
• Heavy (from wave 8)
• Abnormal Boss (from wave 11)
• Shadow (from wave 14)
• Fallen (from wave 21)
• Glitch (from wave 27)
• Hazard (from wave 29)
• Error (from wave 37)

Hardcore

• Abnormal
• Quick
• Hefty
• Invisible
• Balloon
• Lead
• Lead Boss
• Lava (from wave 38)
• Lead Balloon (from wave 40)
• Error (from wave 43)
• Circuit (from wave 44)
• Soul (from wave 46)

Strategy

• The greatest danger mid-game Mysteries pose is the off chance that many high-health enemies spawn from a horde of them.
  • Weaker enemies that spawn, like Abnormals, Quicks or Hefties, are easy to deal with by the time Mysteries debut and are not a cause for concern.
  • Stronger enemies like the Lead Boss are the main threats when dealing with mid-game Mysteries; most defenses are only strong enough to deal with a few of them. As Mysteries are random with their spawns, spikes in enemy count and health are sudden and unforeseen and can easily overwhelm the defense.
    • These moments are the worst-case scenario and do not always happen, though it is usually better to be prepared for such situations.
    • Alternatively, you could play on maps with the Enemies Beta modifier active, which replaces the Mystery with the Breaker2, completely eliminating these possibilities.
• Due to the nature of mid-game Mysteries, lots of defense should be prepared to deal with the worst-case scenario.
  • Fairly cheap high-DPS towers like the Minigunner are very useful.
  • Strong mid-game towers like the Golden Crook Boss or Militant are effective, though weaker ones like the Scout may falter.
  • As Mysteries and their spawns come in hordes, towers that can deal damage to multiple enemies like the Shotgunner, Pyromancer, Gladiator and Demoman are effective.
  • The Military Base is quite good against Mysteries. The Tank and Railgun Tank are particularly effective with their high health and splash damage capabilities.
  • Extra hidden defense should also be considered, especially if the past waves of Invisibles have proved troublesome.
• Later on in the game, Mysteries are able to spawn other enemies, some of which may be threatening.
  • The Circuit from Hardcore mode is the most troublesome. It should be killed before it is able to speed up other enemies, which is usually doable with enough DPS. High-DPS towers like the Accelerator paired with support towers like the Commander should do the trick.
• Be aware that you do not earn any cash from damaging enemies that the Mystery spawns in every mode.
• The enemies that spawn from the Mystery do not need to be killed for wave progression to occur.
  • If you are speedrunning a map, you should focus on killing the Mysteries first by setting your towers' targeting to Weakest before moving onto the enemies that spawn.
    • Be aware that if you get a lot of high-health enemies, like the Lead Boss, they may outrun your towers if you switch target settings.
      • Using towers that can hit multiple enemies can remedy this. The Gladiator is particularly good here.
• The Frost Blaster, Sledger and Electroshocker are the best stalling towers against Mysteries as they can hit multiple enemies at once, though others like the Toxic Gunner are still viable.
• If there are some Mysteries at the end of the map, do not kill them, as they may spawn high-health enemies, severely reducing your base health or even killing you.

Gallery

Previous Variants

Fourth version, second animation (8 May 2021 – 4 December 2021)

Fourth version, first animation (26 May 2020 – 8 May 2021)

Third version (13 October 2019 – 26 May 2020)

Second version (15 July 2019 – 13 October 2019)

First version (14 June 2019 – 15 July 2019)

Corpse Variants

Second Corpse variant, current version (12 March 2025 – Present)

Promotional Images

Mystery on a promotional image.

Promotional Videos

Entity System - Tower Defense Simulator

Mystery on a promotional video.

April Fools 2022 - Tower Defense Simulator

Mystery on a promotional video.

Trailers

Tower Defense Simulator Trailer 2020

Mystery in the game trailer.

Tower Defense Simulator Frost Invasion Trailer

Mystery in the game trailer.

Tower Defense Simulator- ☢️ NUCLEAR Update!☢️

Mystery in the game trailer.

Miscellaneous

Mystery on its Index icon.

Trivia

• The Mystery, alongside its stronger counterpart, the Mystery Boss, have been slowly phases out of all modes and replaced by Breaker2 and Breaker4. They now only appear in Hardcore, if the map does not have Enemies Beta.
  • Despite this, enemies like Mystery have not been fully phases out. Certain new events contained enemies which functioned similarly to Mysteries, these being the Enigma and Frost Mystery from Operation I.C.E Event.
• The appearance of the Mystery was originally based on the Mystery from Tower Battles.
• When the Super Mystery, Ultra Mystery and Uber Mystery were in the game, the Mystery was the only mystery enemy not to have glowing eyes.
• Prior to the Overhaul Update, in regular Fallen mode, the Mystery could spawn the Rusher, even though it is a Polluted Wasteland enemy and did not appear naturally in regular Fallen mode.
• The Mystery and Mystery Boss can learn to spawn new enemies even before its first wave appearance.
• The question mark on the Mystery is a re-textured version of the Question Mark accessory from the Roblox catalog.
• Prior to the Entity System Update, Mysteries summoned from the Summoner Boss could be stuck in the air.
• As the Mystery is always replaced by the Breaker2 with Enemies Beta active, it is currently impossible to see the Enemies Beta appearance of the Mystery.
  • It was possible to see it on Polluted Wasteland II before the Halloween 2022 Update.

Update History

• 14 June 2019 - BETA v1.0.0
  • Mystery added.
• 15 July 2019 - BETA v1.5.1
  • Appearance changed.
• 2 August 2019 - BETA v1.7.0
  • Normal Boss spawn chance massively decreased.
• 13 October 2019 - Release v1.0.0
  • Health increased from 10 to 15.
  • Appearance changed.
  • First wave appearance changed from wave 13 to wave 16 in Easy and Normal modes (now Easy and Molten modes).
  • Bug: Mystery upon death has a chance to not disappear, instead it will have negative health and continue walking, stopping when it reaches a turn or the exit. Increases base health if it reaches the exit.
• 26 May 2020 - Release v1.11.0
  • Health now changes depending on the gamemode. Previously had 15 health in all modes it spawned in.
    • 10 health in Beginner's mode.
    • 25 health in Molten mode.
    • 40 health in Golden mode.
    • 60 health in Fallen mode.
  • Now spawns in every gamemode.
  • Appearance changed. Now emits particles from its torso when killed.
  • Mystery now spawns new enemies depending on the wave. Replaces the Ultra Mystery. Prior to this, it only spawned the Normal, Speedy, Slow, Hidden or rarely the Normal Boss.
    • Enemies inherited from the Ultra Mystery: Abnormal, Quick, Heavy (Radioactive in Polluted Wasteland), Ninja and Abnormal Boss (Wasted Boss in Polluted Wasteland).
    • New enemies it spawns: Molten, Shock, Strong, Bolt, Golden, Charge, Fallen, Glitch, Error (Circuit in Polluted Wasteland) and Rusher.
  • First wave appearance changed from wave 16 to wave 11 in Beginners mode (now Easy mode).
  • Bugfix: Mystery can no longer increase base health if it has negative health and reaches the exit, but the bug happens much more frequently.
• 31 May 2020 - Release v1.11.1
  • Bugfix: Negative health bug made less severe.
• 29 October 2020 - Overhaul v1.0.0
  • No longer appears in the Golden mode as it has been removed.
  • Health decreased.
    • Health decreased from 25 to 10 in Molten mode.
    • Health decreased from 60 to 20 in Fallen mode.
  • Summoned enemies no longer give money when damaged.
  • Now becomes immune to all forms of damage when summoned by the Necromancer Boss.
  • Enemies it spawns changed.
    • New enemies it spawns:
      • Fallen mode: Shadow
      • Hardcore mode: Hefty, Invisible, Balloon, Lead, Lead Boss, Lava, Lead Balloon, Error, Circuit and Soul.
    • Enemies it no longer spawns:
      • Fallen mode: Ninja
      • Regular Fallen mode: Rusher
  • Bugfix: Negative health bug fixed.
• 8 May 2021 - Overhaul v1.3.0
  • Animation changed.
• 4 December 2021 - v1.0.0
  • Animation changed.
• 12 March 2022 - v1.1.0
  • Bug: Mystery has 10 health on all gamemodes.
• 15 March 2022 - v1.1.0c
  • Bugfix: Mystery now has correct health values on all gamemodes.
• 29 July 2022 - v1.3.0
  • Now appears in Polluted Wasteland II.
  • Now has a new appearance with the Enemies Beta modifier active.
  • Enemies it spawns changed.
    • New enemies it spawns:
      • Polluted Wasteland II: Mutated, Mutated Speedy, Hazmat, Mutated Boss, Toxic, Circuit and Rusher.
• 31 October 2022 - v1.4.2
  • No longer appears in Polluted Wasteland II, as it has been replaced by the Breaker2.
• 24 February 2024 - v1.14.0
  • No longer naturally appears in Easy mode.
• 23 May 2024 - v1.23.0
  • Bug: Mystery cannot be targeted or collided with.
    • This was fixed later the same day.
• 2 August 2024 - v1.27.0
  • No longer appears in Fallen mode, as it has been replaced by the Breaker2.
• 11 December 2024 - v1.45.0
  • No longer appears in Molten mode as it has been replaced by the Breaker2.
• 16 December 2024 - v1.46.0
  • Now appears in Polluted Wasteland II, replacing the Breaker2.
• 17 December 2024 - v1.46.4
  • Mystery now appears in Golden mode, Legacy Fallen mode and Legacy Molten mode, if activated through Sandbox mode.
• 17 December 2024 - v1.46.5
  • Mystery no longer appears in Golden mode, Legacy Fallen mode and Legacy Molten mode, as they have been removed.
• 12 February 2025 - v1.53.0
  • Mystery now appears in Golden mode, Legacy Fallen mode and Legacy Fallen mode, if activated through Sandbox mode.
• 19 February 2025 - v1.54.0
  • No longer appears in Polluted Wastelands II.

Legacy Molten
Previous Debut	Current Debut	Next Debut
Hidden Wave 13	Mystery Wave 16	Necromancer Wave 20

Golden
Previous Debut	Current Debut	Next Debut
Shadow Wave 13	Mystery Wave 16	Golden Wave 20

Legacy Fallen
Previous Debut	Current Debut	Next Debut
Shadow Wave 13	Mystery Wave 16	Dark Necromancer Wave 19

Hardcore
Previous Debut	Current Debut	Next Debut
Lead Boss Wave 16	Mystery Wave 17	Mega Slow Wave 19

The Heights (SFOTH Event) (24 June 2019 – 13 October 2019)
Previous Debut	Current Debut	Next Debut
Crystalite Wave 8	Mystery Wave 9	Brute Wave 10

Pre-MEGA (Easy, Normal, Hard & Insane)
Previous Debut	Current Debut	Next Debut
Hidden Wave 10	Mystery Wave 13	Necromancer Wave 14