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Dr. Odin, an octopus scientist, has teamed up with his Dolphin colleague to put a stop to underwater skeletons’ reign of terror!
In this action Tower Defense game, you fend off hoards of skeletons by strategically placing sea creature turrets. Beware that as your line of defense falls, this quickly turns into a game of survival where you dodge around for dear life!

Features

  • Unlock Turrets: Your arsenal is filled with mechanized sea lives! Those cool inventions (such as Pistol Shrimp, Navy Seal, and Death Ray) will handle the fight. You’ll discover new turret types one after another - Figure out how best to utilize each of ‘em!
  • Skeleton Enemies: Did you know that most humans who ever lived are dead? Tons of skeletons end up in the ocean, and are terrorizing local ecosystems. Fight sword-swinging pirates, poison-wielding chemists, and even skeletal dragons… Those skeletons are sure to shake up your playstyle at every turn!

  • Unique Biomes: As you adventure the seven seas, you’ll add more creatures into your turret collection, and face new and exciting dangers. Adapting to changing environments is key to survival: Don’t misstep into a toxic brine pool, or forget your light in the darkness of the deep sea.
  • Turret Upgrades: Skeletons will sometimes drop a variety of Elixirs. Use them to boost turrets into different forms! Will you turn a turret into a frosty ice machine, a powerful mutant, or a shadowy stealth weapon?

  • Boss Fights: Special levels featuring larger-than-life boss enemies with formidable abilities!
  • Awesome Upbeat Soundtrack: Seriously, the composers are amazing
  • Mostly created by one person, while doing college
“The ocean awaits us to reclaim - Let the Operation Octo commence!”
- a message from Dr. Finn the Dolphin (who really needs your help because he’s too lazy to do the work himself)
Operation Octo
Klub Kofta StudioDeveloper
Klub Kofta StudioPublisher
July 2025Release
🎹🖱️ Keyboard + Mouse
🕹️ Partial Controller Support
🎮 Full Controller Support
Very Positive (64 reviews)
Public Linux Depots:
  • [0 B]
Patch 1.2.1 - Ukrainian Localization is here!

Ukrainian Localization

Operation Octo has been translated into Ukrainian by Lavauk! \nPretty good timing - Matches the new Argonaut\'s color scheme ;)

\n\nIf you encounter any bugs while playing, please report them to me on Discord ! \n\n-------------------------------------------------------------------\n\n

Balance Changes

  • Inside Level 2-5 \"Clam Farm\", only pearls that were initially produced by the player (before getting consumed by Argonaut) will count towards the pearl production goal after the Argonaut refunds those pearls

    [/*]
  • This is to prevent Argonaut spam from becoming the ultimate Clam Farm speedrun strat; Note that due to coding limitations, new Argonauts spawned by Mutant Argonaut will not remember if their stored pearls were produced by the player.

    [/*]

  • Frosty Sniper Turtle now has passive regen

    [/*]
  • This is to further incentivize using Frosty Turtle as a frontline tank, differentiate this upgrade from the other Frosty upgrades, and offer additional benefits to having one more of this single-target slow-er.

    [/*]

\n-------------------------------------------------------------------\n\n

Bug Fixes

  • Fixed a glitch where Argonaut could gain additional stored pearls when upgraded

    [/*]
  • We fixed this bug live during a Discord stream ;) Upgraded Argonauts had been secretly producing extra pearls - They\'ll feel a bit less insane now after the fix.

    [/*]

\n

  • While a turret ball is tossed in mid-air inside a Graveyard, you can no longer exit the region or start simulation

    [/*]
  • While selling a turret inside a Graveyard, you can no longer exit the region

    [/*]
  • This prevents the turret you\'re about to place down from going missing if you left prematurely, since the turret\'s placement doesn\'t get saved until it is truly deployed.

    [/*]

\n

  • Fixed a glitch where the Frogfish card drop after Level 2-4 is shown as a turret card instead of a gadget

    [/*]

\n-------------------------------------------------------------------\n\n

Misc Changes

  • Fixed Hollow Argonaut\'s manual entry, which erroneously displayed its \"Damage\" as \"Heavy\"

    [/*]
  • Hollow Argonaut\'s manual entry now displays \"Ghostly\" trait

    [/*]

[ 2025-11-20 17:55:42 CET ] [Original Post]

Minimum Setup

  • OS: Ubuntu 18.04 or higher
  • Processor: SSE2 instruction set supportMemory: 2 GB RAM
  • Memory: 2 GB RAM
  • Graphics: OpenGL 3.2 or higher
  • Storage: 2 GB available spaceAdditional Notes: Unity 2D - Has option to disable shaders
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