Unstable Ice

Unstable Ice

Frost Invasion • Operation I.C.E

Sandbox Only Content

---

Unstable Ice (Frost Invasion) was previously removed from the game on the 4th of December 2021 as it was part of the Frost Invasion Event, though it has been made available through the Sandbox mode.
It is not accessible anywhere else in the game, aside from in Sandbox Mode. This page will attempt to include information about both the version before removal and its re-added version.

Unstable Ice
Mode Appearance	Sandbox via Logbooks Originally: Frost Invasion
Wave Debut	11 (Originally)
Statistics
Base Health	200
Speed	Above Average (4)
Spawned By	Frost Mystery (Wave 13 onwards)
Hidden?	No
Flying?	No
Ghost?	No
Lead?	No
Attributes	None

Description

The Unstable Ice was an enemy that appeared exclusively in Outpost 32 as part of the Frost Invasion Event. Currently, it can be spawned in the Sandbox mode, though it copies the Operation I.C.E Event Unstable Ice statistics. For its debut, it had a decent amount of health and walked slightly faster than the Snowy. It had an ability, Flash Freeze, where upon its death, the Unstable Ice would expand into an ice bubble which would freeze all towers within the radius, including cliff and air-based towers. This allowed enemies with much greater health, like the Snow Golem and Frost Invader, to seep through your defenses while your towers were stunned. However, it no longer creates an explosion upon death in Sandbox mode.

The Frost Mystery had a chance to spawn the Unstable Ice upon its death, from wave 13 onwards.

Appearance

The Unstable Ice has neon blue skin with a dark blue translucent outline encapsulating its entire body. Dark blue translucent spikes can be seen on its shoulders and on the tops of its arms. The Unstable Ice is faceless. Small ice particles are emitted from its torso.

Event Strategy

Strategy listed here was made for the Frost Invasion Event.

• You can use long-range towers, like the Ranger, to kill the Unstable Ice from a long distance, preventing your towers from being stunned.
• Fast-firing towers, like the Minigunner and Accelerator, can quickly kill the Unstable Ice.
  • However, they risk getting frozen when the Unstable Ice dies.
• Short-range towers, like the Gladiator or Sledger, are not recommended against the Unstable Ice, as their short range means they are much more likely to get stunned by the Unstable Ice.
  • The Gladiator cannot block the Unstable Ice's Flash Freeze.
• The Medic is not immune to the Unstable Ice's Flash Freeze, nor can it unfreeze towers that have been frozen by the Unstable Ice.
• While the Military Base units cannot be frozen by the Unstable Ice, if a unit is caught in the Unstable Ice's Flash Freeze radius, the unit will be dealt 80 damage.
  • This means that the Tank and Railgun Tank are the only viable units that can be used against the Unstable Ice.
    • The Crook Boss' units will be instantly killed if they are caught in the Unstable Ice's Flash Freeze.
• Air-based towers, like the Ace Pilot and Pursuit, will be frozen by the Unstable Ice, if their tower (runway and helipad, respectively) are caught in the Flash Freeze radius.
• If the Unstable Ice is on fire as it dies (due to the Pyromancer), the radius of Flash Freeze is reduced by 33%.
  • Additionally, as with all enemies in the Frost Invasion Event, the Pyromancer deals double fire damage to the Unstable Ice (though normal damage is not doubled).

Gallery

Trailers

Tower Defense Simulator Frost Invasion Trailer

Unstable Ice in the game trailer.

Miscellaneous

Unstable Ice on its icon.

Trivia

• The explosion that the Unstable Ice created upon its death had a unique studded texture at the top.
  • This explosion also emitted light for a short time.

Update History

• 8 May 2021 - Overhaul v1.3.0
  • Unstable Ice added.
• 4 December 2021 - v1.0.0
  • Unstable Ice removed.
• 20 December 2024 - v1.47.0
  • Unstable Ice can now be summoned in Sandbox mode, only when the player has the Unstable Ice's from Operation I.C.E Event Logbook.
  • Bug: No longer explodes upon death.
• 12 February 2025 - v1.53.0
  • No longer copies the statistics of the modern version in Sandbox mode.

Outpost 32 (Frost Invasion Event) (8 May 2021 – 4 December 2021)
Previous Debut	Current Debut	Next Debut
Snow Golem Wave 10	Unstable Ice Wave 11	Deep Freeze Wave 12