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 epic campaign across 20 levels.
User reviews: Positive (46 reviews)
Release Date: Nov 26, 2010
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About This Game

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 epic campaign across 20 levels.
* A powerful commander unit which can level up and gain new abilities as you play.
* Over 20 unlockable turrets, orbital ship weapons, automated drones and abilities at your disposal.
* Customize your weapon loadout in the Armory to match the demands of the mission.
* NEW: Includes new content featuring new commander, enemies, campaign, weapons and more!
* Endless modes for all maps.
* NEW: Steam Achievements
* Classic mode allows you to compete for scores in a pure skill-based game mode.
* Exclusive music by Specimen A.

System Requirements

    • 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
    • Hard Drive: 300 MB available space
Helpful customer reviews
4 of 5 people (80%) found this review helpful
154.5 hrs on record
Posted: December 13, 2014
This is one of my favorite Tower Defense games from mobile and I like the PC port, would have been nice to see some exclusive PC content but the core game is still here and that is good for me.
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3 of 4 people (75%) found this review helpful
11.7 hrs on record
Posted: February 9
Sentinel 3 is a tower defense game with addition of commander who has several abilities that can change the outcome of the game . There is a bit of RPG elements us you can choose the stats for your commander like strength,life,accuracy and morale .

Game has 4 diffeculties each granting higher EXP and credits. So it rewards you for playing higher diffeculty which is awesome . Some stages require you to defend several routes at the same time so it can be challanging .

You can use credits to unlock slots for new turrets and buy weapons for the robot .

Game has several gameplay modes like campaign,endless and classic .

Good buy for couple $
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6 of 10 people (60%) found this review helpful
1 person found this review funny
251.4 hrs on record
Posted: February 15
Tower Defense games are fun to me. I own a bunch, however, this one was a drag. The playtime required to get a 100% achievements was too much, plus there was no count-down after the 100K aliens killed mark. If the developers would listen to the fans in the forums and react to the input, I will change my recommendation, but for now... there's a lot of better games to choose from.
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83 of 101 people (82%) found this review helpful
1 person found this review funny
2.3 hrs on record
Posted: February 7, 2014
First things first:


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 else). It only runs in window mode or in a stretched (!) fullscreen mode. Really, really bad. I have a native resolution of 1920*1200, so why the hell can't I get this exact resolution in the game? Instead I get this ugly, stretched mess. But ok, I can live with it. Tower defense games were never about the graphics, right? The interface is exaxtly what I know from the iphone. They really didn't change a thing. For instance, if you drag a weapon to a free slot in the armory, it becomes zoomed in in your hand/mouse cursor, which makes sense on a mobile device. It looks horrible and ridiculous on a full HD display though. And they added absolutely nothing. No achievments, no trading cards, no nothing. I really have to assume, that the developers only wanted to make a quick buck with this.

Which is really a shame, because the game itself is actually great. It is exactly what i expect from a tower defense game. Looking at all the newer TD games which try to implement more interaction (like running around with a hero), this is rather old-school. And it is exactly how i like my TD games. Searech for optimal spots for your towers. Find the right balance between getting lots of interest each round and not dying. Love it! And the commander is a nice addition to the already great gameplay of its predecessors. It gives you a little bit of additional interaction, but not too much. For me personally the commander is about as much interaction (besides placing and upgrading towers) as I can take. Perfect!

I really like this game, and that's why it gets a thumbs up. I was really struggling though, because this port is basically a punch in the face of all Sentinel fans. I would have expected more. I pay more money for this than on the iphone after all, so I think i can expect more, right? Whatever, the game is still a lot of fun. If you like traditional tower defense games, this might be the game for you.
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58 of 70 people (83%) found this review helpful
16.2 hrs on record
Posted: February 8, 2014
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 over for mouse), and the graphics are poorly detailed when viewed on a normal sized computer monitor or TV.

I think if these guys had just put in a bit more effort, it could have been a good port. As it is for now, there are better tower defense games to be played instead.
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61 of 88 people (69%) found this review helpful
1.5 hrs on record
Posted: February 3, 2014
Solid, Simple, Tower Defense for fans of the genre. This is primarily a fixed path, but flexible tower placement game. Not a maze builder.

After about 30 minutes of play, it appears to just be a bug free, direct port, of the mobile version. That is not necessarily a bad thing. I already own the android version and have beaten it before. Too many mobile to PC ports are buggy right off the start. So far this works fine for me in either full screen or windowed mode. Thumbs up to a smooth mobile to PC transition for the Devs.

It’s a good addition for fans of the genre, especially if you don’t already have it on your tablet or phone. This is best for those that prefer a more 2D tower defense where you focus on upgrades and tower placement like Onslaught, Fieldrunners, iBomber Defense, or Defender’s Quest.

If you prefer a more complex fully 3D tower defense that uses more of the PC’s gaming power I’d recommend checking out Prime World: Defenders, Dungeon Defenders, Sanctum (1 or 2), or Defense Grid.

I enjoy both the simple 2D and complex 3D Tower Defense games. So I was more than happy to add Sentinel 3 to my Steam collection.
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27 of 39 people (69%) found this review helpful
1 person found this review funny
29.3 hrs on record
Posted: August 8, 2014
I hate myself for trying to play this game, it starts out good (first hour) but then it's the same over and over again. The more difficult it gets the longer it takes to clear the stages (it actually doesnt raise the difficulty) so its always easy. It just takes forever, It's will slowly drain the life out of your soul,

2 campains / 40lvls of the same stuff, 4 difficulty settings = 160, + endless and challenge mode = i dont know 40 more / 200 levels

A level usually takes 20min on easy and up to and hour on hardest, on endless mode its infinite so if you want to beat the game, its atleast 200hours. And it's the same thing over and over again, you dont need to think or do, just sit there and watch for 200hours, sounds like fun right? well it's not!
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11 of 17 people (65%) found this review helpful
1 person found this review funny
8.8 hrs on record
Posted: May 17, 2014
This game BARELY cuts the mark for that yes, and it's for the reason everyone assumes: the port is clearly an afterthought and I was never allowed to forget that while playing. For example, I eventually started pausing mid level every time I wanted to upgrade a tower, because actually selecting one with the mouse is a hit and miss thing - it tries to grab and slide the screen instead, which is utterly useless since the whole map fits fine in my screen. And don't start me on the level selection slider. The appropriate asking price tipped the scale towards yes for me.

That huge aside aside, this is a solid tower defense game of the more traditional variety, with fixed paths and some interesting mechanics - just don't expect a reinvention of the wheel. The maps of the campaigns repeat once too often for my liking, however they're intersting enough and at times challenging. I like the difficulty, though the curve can occasionally be steep and some grinding seems to be encouraged. It is mildly addictive, the graphics are fine and scale alright, the music is okay but can get very repetitive. All in all, as TDs go this one is lukewarm: decent, not great, not bad.

Pet peeve: It's really sparse on information about the levels, the enemies, the towers and the upgrades. I especially miss details on the enemy types (an icon and a level are not info enough in my book). More practical details at the level selection page would also help plan what towers/weapons to pack along. However, since many of the maps are pretty solidly geared towards one or two winning strategies, you could consider that part of the design: this is less a plan ahead and stratgize sort of TD and more a "jump right in and take the hits as they come" one. Personally, I consider the lack of information just another sign of a game made for smaller screens and less reading.

So buy? Yes, I suppose, if you're a TD fan and running dry. Especially if it's discounted and practically free. There are many MANY great TD games for PCs out there and this isn't one of them, but it gave me enough hours of fun to pay for itself.
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5 of 7 people (71%) found this review helpful
21.5 hrs on record
Posted: March 3, 2014
A lot of people complain about games that are ports from other systems, but I can't say I have a problem with them so long as they are ported well. While this may be an phone app port, I have to say I'm really enjoying it. Personally I have more problems with console ports (due to poorly implemented keybinding options or only supporting the XBOX controller; Deadpool being a HUGE example of this) than phone app/flash ports, so this was a pleasant surprise when I found how much I'm enjoying a game that was originally a phone app. The only gripe I have about it is the fact that you have to click & drag the towers to the location you want to drop them to, which is a bit of an issue if you accidentally release the button & drop the tower somewhere you don't want to (luckily not all areas in a map are buildable). Other than that, I would probably give this game an overall rating of 8 out of 10. Music would be 9 out of 10, it lost a point for being somewhat repetitive (the music you hear in the trailer is exactly what you hear in the game).
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6 of 10 people (60%) found this review helpful
18.0 hrs on record
Posted: September 26, 2014
So, you are piloting this huge power armor reminiscent of the Tau Commander from Warhammer 40k and one of those ugly robots from Avatar (the movie). Then imagine you are outnumbered, outgunned and outmaneuvered by an evil alien race with infinite numbers of weapons and units. But imagine that despite this, against all odds, you and a handful of auto-turrets and drones join forces and open fire at them while screaming "THIS IS MY HOMEWORLD, WE WANT HOMEWORLD RELEASED ALREADY!! DAKKA DAKKA DAKKA DAKKA!!"

And boy by that glorious scream the dakka flows.

That's Sentinel 3: Homeworld in a nutshell. A pretty fun tower defense, nowhere near the quality of a Defense Grid but damn fun! Special mention to the OST, which has some sort of trance-house style that reminded me of some PC games of old. Bad points for the surpride dubstep of the main menu theme though. But guess a giant bada$$ mech that stomps enemies and causes shockwaves can go all "wub wub wub" while firing twin miniguns.

Another special mention to the Laser Tower, aka, the dubstep tower. Seriously, build laser towers and watch those rows of enemies burn all at the same time in a glorious rain of fire.

Considering the game seens to go for sale frequently, this can be a great purchase indeed!
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7 of 12 people (58%) found this review helpful
12.3 hrs on record
Posted: February 13, 2014
As tower defense goes this is a great example. I wouldn't say it brings anything truly unique to the table, but gameplay is solid, re-playability good, and progression fun. Advised to any TD fan.
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3 of 5 people (60%) found this review helpful
9.2 hrs on record
Posted: October 14, 2014
I recommend this game because it makes fun, but it gets boring after playing some missions. If it is on sale, you may grab this game else stay away ;)

Beside that.. full screen does not work.
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3 of 5 people (60%) found this review helpful
36.6 hrs on record
Posted: February 21, 2014
I have been playing TD games for quite a while, and I'm more "Selective" now with this genre... Said that I'm really enjoying this game

Scenarios with lots of waves... a Commander to level up.... and Maximized towers that really make a difference!
What else can I ask for in a TD game? ;)

Old-School graphics really don't bother me
Good price for hours of gameplay ;)
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3 of 5 people (60%) found this review helpful
22.2 hrs on record
Posted: October 15, 2014
This is actually a really nice tower defense game! Some of the complaints here are valid, however, I still managed to find almost 20 hours of enjoyment in this game. Very simplistic and casual, if this interests you...get it! Great graphics, great sound, great gameplay, and great user interface. Totally worth the money! Would buy again...9/10.
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9 of 19 people (47%) found this review helpful
50.6 hrs on record
Posted: February 7, 2014
This game has all the trappings of the tried and true tower defense formula:

There's the paths, baddies walk along it. There's the Land / Air dichotomy. There's the cheap damaeg tower, the slowing tower, the damage over time tower, the expensive zapping tower. There's some abilities you can use when you need that extra ooomph against the baddies when you need it. There's the mechanic of gaining interest on the money you've saved. There's occasional baddies that are resistant to X. There's the standard list of enemies: The Standard Baddie, The Swarm, The Slow Tough Guy.

So far, it has all the trappings of a standard TD game.

The feature that makes Sentinel 3 different than most tower defense games is your Sentinel, a robotic character that can jump back and forth between gates on the map and engages in combat on its own. It has its own set of abilities and can be leveled up over time.

Unfortunately, the Sentinel isn't engaging or interesting enough to raise this game from generic to something special. This is especially true in the later waves of the later maps: The Sentinel's capabilities are of little importance compared to your towers as the game progresses.

Also, there's very little in the way of interesting choices.

There's a limited number of slots for towers available to you, but you can purchase more over time. Even if the tower selection were more limited, it's possible to beat the campaign and get quite far in the Endless modes with just 3 different towers. Tower placement, in general, isn't all that critical either. Stick the slowing towers in the right spot, spam damage everywhere else.

Although the different levels of difficulty do indeed make the game more difficult, they don't make the game more interesting or encourage you to make different choices.

The only real choice one has in the game is where to spend the upgrade points on your Sentinel; you don't have enough to completely max out all of the stats. Unfortunately, as mentioned above, the Sentinel is almost inconsequential later on, so your choices here don't matter all that much past the first 20 waves or so.

If you're a Tower Defense Junkiie and absolutely must play everything available to you then you might want to purchase this. For everyone else you may want to pass, despite the low price of the game itself. Better, more engaging experiences can be found on many Flash game sites for free.
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3 of 7 people (43%) found this review helpful
18.5 hrs on record
Posted: May 16, 2014
Best TD game EVER!!!

great port from the mobile version. full screen work perfect.
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2 of 5 people (40%) found this review helpful
4.2 hrs on record
Posted: March 30, 2014
I don't agree with some of the harsher reviews on this game. This is a pretty good TD game. I own it both for the PC and Steam and I enjoy them both. The graphics are just fine and look good on my 1440p monitor. I do have a few complaints about the interface, though. To me, the space bar should pause the game, but it does not. Escape should open a menu, but it closes the game with no warning. This game also runs really hot on my video card. The fan on my GPU maxes out when this thing is running, so there must be some real inefficient code running behind the scenes. The game still works just fine, though. I would recommend this to anyone who likes TD. You can see samples of this playing in HD on youtube.
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10 of 22 people (45%) found this review helpful
1.3 hrs on record
Posted: May 20, 2014
About what you would expect from a 5 dollar game... except that its a couple bucks more than that.

Its a TD game, but not a very good one. The levels are all very bland and "samey," there are very few enemy types (although they can vary in strength amongst their kind), and it is very easy. The game never introduces anything which forces you to change your play style; your first two towers are all that you need to beat most every level.

The game tries to add some spice to the typical TD recipe by including a commander unit who can move from one key point to another and engage the enemies directly, except that it isnt very well implemented. There is no penalty if he dies, and he doesnt really do much for a very long ways into the game. The key locations that he can guard are basically capable of handling themselves without his help, as long as you add one bomb turret and a couple of lasers.

The game feels short, even though it takes awhile to beat. There are only a small number of maps available, so the game repeats several of them with "different" waves of enemies (which dont feel different at all due to the limited variety) and tries to extend gameplay by making you face absurdly high wave counts (50+ for most levels).

I like TD games, and i have played a ton of them... but this game felt half ♥♥♥♥♥ and amateur. There are plenty of good TD's out there; this one isnt worth your time.
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6 of 15 people (40%) found this review helpful
5.4 hrs on record
Posted: February 5, 2014
such a good game, good mix of tower defence and a slight RPG elements. 8/10
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5 of 13 people (38%) found this review helpful
0.4 hrs on record
Posted: February 5, 2014
Loving the game, it's simple, addictive and great fun. I have played every Sentinel game on multiple formats, can't wait for the next one.
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