⚜ SteamCozy

Home / Games / Sentinel 3: Homeworld

Sentinel 3: Homeworld

Sentinel 3: Homeworld

The biggest installment of the award winning Sentinel sci-fi tower defense series now on PC!Take the fight to the alien homeworld and unleash a massive arsenal of weaponry. Get up close and personal on the battlefield in your power armor to execute devastating attacks and support your defenses! * An

Released Feb 3, 2014 Developer Origin8 Publisher Strategy First Platforms Windows Tower DefenseStrategyIndieSci-fiAction
View on Steam ↗ $5.99 (US · as of 2026-05-13)

What players say

Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-28.

79.7%positive148 reviews
Recommended · 124 found this helpful

“First things first: ------------------------------ THIS IS A HORRIBLE PORT! ------------------------------ I am sorry, but it is. This is exactly the mobile game, ported to PC without changing anything. It has no resolution options (and only a low/high quality setting, nothing…”

— a player, Steam review · 2 hrs played
Recommended · 17 found this helpful

“An average game in 2018 which was great in 2010 I suppose. Sentinel 3 is the third game in series. It adds some new fresh mechanics. It distinguish the game from other TD games. https://steamcommunity.com/sharedfiles/filedetails/?id=1409129806 The plot is usual. Aliens attacks…”

— a player, Steam review · 4 hrs played
Not recommended · 130 found this helpful

“This was a solid tower defense game on android. The Steam version suffers from being a lazy port. The controls haven't been properly reworked for PC, the slider where you select your mission is slightly bugged (clearly intended to be swiped with a finger and just badly ported…”

— a player, Steam review · 16 hrs played
Read more reviews ↗

Achievement stats

Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-09-28.

47achievements
31.8%median completion
3.2%rarest: Alien Extinction
87.6% of players 83.4% of players 81.9% of players 79.7% of players 75.5% of players 70.9% of players 67.1% of players 61.3% of players 59.2% of players 52.9% of players 49.2% of players 47.6% of players 44.2% of players 42.7% of players 41.7% of players 40.6% of players 39.2% of players 37.2% of players 36.0% of players 35.2% of players 35.2% of players 33.6% of players 32.7% of players 31.8% of players 30.4% of players 29.7% of players 29.5% of players 29.4% of players 29.2% of players 27.8% of players 25.3% of players 22.9% of players 21.2% of players 18.0% of players 12.4% of players 11.7% of players 11.0% of players 9.3% of players 7.8% of players 7.7% of players 7.5% of players 7.4% of players 7.1% of players 6.1% of players 4.6% of players 4.5% of players 3.2% of players 87.6% 0% most earned rarest
Almost everyone has
87.6%Mission 1 — Complete mission 1 of the original campaign
83.4%Laser Upgrade — Fully upgrade a laser turret
81.9%Mission 2 — Complete mission 2 of the original campaign
Rarest badges of honor
3.2%Alien Extinction — Kill 1,000,000 aliens
4.5%Able Commander — Unlock all commander abilities
4.6%Hero Commander — Reach maximum commander level

Latest official news

Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.

Jun 04, 2015
Vote for Sentinel 4: Dark Star on Steam Greenlight!

http://www.origin8.com/wp-content/uploads/cropped_header_greenlight.png Sentinel 4: Dark Star is now up for consideration on Steam Greenlight , and we need your support! Hit the link and give us a thu

Jun 04, 2015
Vote for Sentinel 4: Dark Star on Steam Greenlight!

http://www.origin8.com/wp-content/uploads/cropped_header_greenlight.png Sentinel 4: Dark Star is now up for consideration on Steam Greenlight , and we need your support! Hit the link and give us a thu

Jun 04, 2015
Sentinel 3: Homeworld update 1.3.0.0 now live!

Today we've got an update with a couple of general enhancements: Added VSync which will cap the framerate to the refresh rate, thus reducing CPU load on fast machines as well as improving visual quali

Jun 04, 2015
Sentinel 3: Homeworld update 1.3.0.0 now live!

Today we've got an update with a couple of general enhancements: Added VSync which will cap the framerate to the refresh rate, thus reducing CPU load on fast machines as well as improving visual quali

Jun 25, 2014
Sentinel 3: Homeworld v1.2.0.0 - XP and Vista compatibility fix

Hi folks, Sentinel 3: Homeworld v1.2.0.0 is now live, fixing a compatibility issue with Windows XP and Vista systems. As always, if you have any feedback on this release, head over to the forums and l

Games like Sentinel 3: Homeworld

From our knowledge graph — ranked by shared traits, not a black box. Each card says why it's here.

Defense Grid: The Awakening Defense Grid: The Awakening 96.2% · 4,023 reviews shares Tower Defense, Sci Fi, Strategy, Action Gratuitous Space Battles Gratuitous Space Battles 70.4% · 750 reviews shares Tower Defense, Sci Fi, Strategy, Action Anomaly: Warzone Earth Anomaly: Warzone Earth 82.9% · 1,756 reviews shares Tower Defense, Sci Fi, Strategy, Action Sanctum Sanctum 90.1% · 2,215 reviews shares Tower Defense, Sci Fi, Strategy, Action Revenge of the Titans Revenge of the Titans 80.2% · 885 reviews shares Tower Defense, Sci Fi, Strategy, Action Infested Planet Infested Planet 94.0% · 2,262 reviews shares Tower Defense, Sci Fi, Strategy, Action Sanctum 2 Sanctum 2 89.9% · 7,958 reviews shares Tower Defense, Sci Fi, Strategy, Action Super Sanctum TD Super Sanctum TD 83.3% · 861 reviews shares Tower Defense, Sci Fi, Strategy, Action

Screenshots

Official Steam store screenshots — click any shot to enlarge.

Facts & details

From the Steam store record, snapshot 2026-09-28.

GenresIndie, Strategy
Player tagsTower Defense · Strategy · Indie · Sci-fi · Action (SteamSpy community voting)
FeaturesSingle-player · Steam Achievements · Family Sharing
LanguagesEnglish
Achievements47
Official sitehttp://www.origin8.com/sentinel3/
Minimum system requirements (PC)

Minimum: OS *: Windows Windows Vista or Windows 7 Processor: 1.2GHz+ Processor Memory: 1 GB RAM Graphics: OpenGL 1.3 gfx card/driver with 128+MB Video Ram Storage: 300 MB available space