Invisible

Sandbox Only Content

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Invisible was previously removed on the 5th of June 2026, though it has been made available through the Sandbox mode later.
It is not accessible anywhere else in the game. This page will attempt to include information about both the version before removal and its re-added version.

Invisible
Mode Appearance	Sandbox Originally: Hardcore
Wave Debut	10 (Hardcore)
Statistics
Base Health	22
Speed	Slightly Fast (5)
Spawned By	Grave Digger (Legacy version, Hardcore only) Mystery (Hardcore only) Fallen Reaper
Hidden?	Yes
Flying?	No
Ghost?	No
Lead?	No
Attributes	None

Do you see anything???

―Commander dialogue on Wave 10 (Hardcore)
Commander dialogue on Wave 10 (April Fools 2022 Hardcore)

Description

The Invisible was a Hidden enemy that only appeared in Hardcore mode. Currently, it can only be spawned in Sandbox mode if the player has the Sandbox Plus+ gamepass. The Invisible cannot be attacked by towers without hidden detection. Compared to the Abnormal, it is slightly faster than it. It also has more health than the Hefty.

The Invisible could be spawned by the Grave Digger on Hardcore mode. The Mystery could also spawn the Invisible upon its death in Hardcore mode.

Appearance

The Invisible is a completely transparent enemy with a slightly noticeable light blue outline. It is faceless.

It will fade completely, then fade back into view at regular intervals.

Strategy

This strategy refers to the state of the game while the Invisible still appeared in the Hardcore mode.

• Towers with hidden detection are the best way to attack the Invisible.
  • Most early game towers gain hidden detection. Such towers are recommended to deal with early Invisibles.
    • Towers such as the Militant or the Golden Soldier are good example.
    • As the Invisible spawns in hordes, the Golden Pyromancer is particularly useful.
    • The Warden is also a great option, although it is slightly costly to get.
  • Towers like Minigunner and Accelerator are likely too expensive for when Invisibles debut. However, they are great at dealing with Invisibles later on in the game.
• For splash damage towers that cannot target Invisibles, such as the Mortar, if an Invisible is caught up in an explosion, they will be dealt splash damage.
  • This means that another detectable enemy must be near the Invisible for a splash damage tower to hit the Invisible.
• Units (like Military Base vehicles) cannot target the Invisibles but can damage Invisibles through collision.
  • The Level 2 Military Base is viable against Invisibles.
  • The Pistol Goon and Tommy Goon 1 do have hidden detection though, so they can be useful against the Invisible.
    • However, do not rely on the Pistol Goons, as they do not have enough DPS to suffice.
• The Frost Blaster can be quite useful against the Invisible because of its freeze and piercing projectile.
• Multiple Level 0 or 1 Trappers can also be a good counter against Invisibles.

Gallery

Corpse Variants

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

Miscellaneous

• 
  Invisible on its Index icon.

Trivia

• The Invisible, true to its name, is barely noticeable.
  • The Invisible can be even harder to notice in maps with bright colors.
• During private Hardcore testing, the Invisible had 35 health.
• When killed, the Invisible leaves behind the same particles the Mystery does.

Update History

• 29 October 2020 - Overhaul v1.0.0
  • Invisible added.
• 2 August 2024 - v1.27.0
  • Bug: Now emits the Mystery's death particles on death.
• 5 June 2026 - v2.0.0
  • Invisible removed from the main game, as it has been replaced by Phantom. Now appears exclusively in Sandbox mode.
  • No longer appears in the Index.

Hardcore
Previous Debut	Current Debut	Next Debut
Hefty Wave 7	Invisible Wave 10	Balloon Wave 12