Aperture Tag: The Paint Gun Testing Initiative is a Portal 2 Mod. It's time to think with Gels! The Portal-Gun is gone, but the testing must go on! Grab the Paint-Gun Device and solve brand new test chambers in ways you've never solved them before!
User reviews:
Mostly Positive (70 reviews) - 74% of the 70 user reviews in the last 30 days are positive.
Mostly Positive (2,259 reviews) - 76% of the 2,259 user reviews for this game are positive.
Release Date: Jul 15, 2014

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Community-Made Mod

This community-made mod requires that you have Portal 2 installed prior to running this game.

Click here to learn more about mods on Steam.

Aperture Tag: The Paint Gun Testing Initiative



“If you're like me, when you played Portal 2, you covered every room in as much bouncy gel as possible. Well now it's a whole lot easier, and you can color coordinate the walls with orange gel.”

“A surprising and fresh revival of Portal 2’s familiar puzzle elements.”
Jeep Barnett

“It looks great, it plays well, and it lasts 2-3 hours, giving it good value for money.”

Steam Greenlight

About This Game

Aperture Tag: The Paint Gun Testing Initiative is a community-made mod for Portal 2, inspired by TAG! The Power of Paint. The familiar Portal 2 gels are now contained within the Aperture Science Paint Gun Device and it's your job to test it out!

Featuring a new personality-core and an original story with 27 polished levels; the mod offers an exciting and fun experience in varied and interesting new locations throughout Aperture Science.

Introducing gels as the core gameplay mechanic completely changes the way you solve puzzles, explore, and survive all the challenges thrown at you!

Key Features

  • New Gameplay Mechanics for Portal 2
  • 27 Original Maps and a Full Campaign
  • A New Character with Original Voice-Acting
  • In-Game Level Editor
  • Access to the Source Files used to create the Aperture Tag
  • Single-Player and Co-op Workshop Integration with Source Instances to create your own Paint Gun Maps
  • Steam Trading Cards
  • Full Developer Commentary
  • Completely original Soundtrack by Abarax, Harry101UK, and Christopher McEvoy

System Requirements

Mac OS X
    • OS: Windows 7 / Vista / XP
    • Processor: 3.0 GHz P4, Dual Core 2.0 (or higher) or AMD64X2 (or higher)
    • Memory: 1GB XP / 2 Vista GB RAM
    • Graphics: Video card must be 128 MB or more and should be a DirectX 9-compatible with support for Pixel Shader 2.0b (ATI Radeon X800 or higher / NVIDIA GeForce 7600 or higher / Intel HD Graphics 2000 or higher).
    • Storage: 4 GB available space
    • Additional Notes: Requires a Steam version of Portal 2 Installed
    • OS: MAC OS X 10.6.7 or higher
    • Processor: Intel Core Duo Processor (2GHz or better)
    • Memory: 2 GB RAM
    • Graphics: ATI Radeon 2400 or higher / NVIDIA 8600M or higher / Intel HD Graphics 3000
    • Storage: 4 GB available space
    • Additional Notes: Requires a Steam version of Portal 2 Installed
Customer reviews
Customer Review system updated Sept. 2016! Learn more
Mostly Positive (70 reviews)
Mostly Positive (2,259 reviews)
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1,490 reviews match the filters above ( Mostly Positive)
Most Helpful Reviews  In the past 30 days
5 of 6 people (83%) found this review helpful
3.2 hrs on record
Posted: October 9
Кхм. Даже не знаю что сказать!
Я не понимаю, почему все жалуются на цену, ведь разработчики не только вложили время, но и собственные деньги..
(Сколько там коммерческая лицензия стоит? - Ммм, 30 тысяч долларов?)
Отличный сюжет, новый геймплей, хорошие и продуманные тесты!
Игра не стоит своих денег, она стоит больше этой жалкой суммы!
Я очень рад, что купил данный мод..
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3 of 4 people (75%) found this review helpful
1 person found this review funny
3.9 hrs on record
Posted: October 3
Still a pretty decent puzzle game if you love playing Portal. The awkward thing is: this is the ONLY paid Portal 2 mod on Steam and there are free but much more polished mods available. Maybe try to wait for this thing to become free eventually...
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1 of 1 people (100%) found this review helpful
3.1 hrs on record
Posted: October 9
If you're like me the game wouldnt boot up. It goes through the loading screen and crashes. Sucks right? Well theres a pretty simple fix.

- Locate Aperature Tag's files by doing the following:
- Click on Finder, at the top of the screen to the RIGHT of the Apple button click "Go" then click "Go to folder...".
- Type: ~/Library/Application Support/Steam/steamapps/common
- Locate the Aperature Tag folder
- Once inside DELETE the folder named "bin"
- Then go back and open the Portal 2 Folder
- Once inside COPY the "bin" folder
- Then go back to the Aperature tag folder
- Lastly once inside PASTE the "bin" folder you copied
Boot up Aperature tag and it should hopefully load, worked for me and a few others


No doubt a very good Portal 2 mod, i enjoyed every bit of it. If you're a protal fanatic (like me) its a must have.

The only thing that dissapointed me was the ending. Other than that it was a great game.

Also I would of loved to see more levels that included the high speed reactions like when exiting the reactor.
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1 of 1 people (100%) found this review helpful
3.1 hrs on record
Posted: October 22

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2 of 3 people (67%) found this review helpful
4.7 hrs on record
Posted: October 7
Major problem is that it leaves you wanting more... and Portal 3 is not coming :sadrealization:
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1 of 2 people (50%) found this review helpful
3.6 hrs on record
Posted: October 4
At first I thought to myself, wow a mod I have to pay for? What kind of rip off is this? I skipped over this until I saw there was a sale and the mod was only a dollar..

I should have paid full price, the devs deserve it

10/10 music
10/10 gameplay

you know those parts in portal where everything is fast paced and you solve a puzzle like its second nature while your flying at walls through things etc? Imagine that, but 20x cooler and faster paced.

overall 10/10 worth every penny
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2 of 4 people (50%) found this review helpful
1 person found this review funny
Not Recommended
0.3 hrs on record
Posted: October 5
visuals are somehow way worse then Portal 2
i´dd prefer text instead of that you-tuber-boi-voice as a narrator
and the first few chambers appear as one and the same
basecly no story

most of the free community maps i played are better then this enteier mod :/

ffs valve give us Portal 3 allready
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5 of 10 people (50%) found this review helpful
Not Recommended
1.7 hrs on record
Posted: October 4
-=DO NOT=- Be fooled into buying this. After watching the tutorial video a friend of mine bought 2 copies. We launched the game to find out that there isn't actually co-op. Sure you can get workshop modded games to get co-op, but the game doesn't have the right to state it's CO-OP if there isn't a SINGLE BASE CO-OP option. We then said screw it and started downloading workshop co-op maps as that's the only way to do co-op. Small issue however, is that your paint gun disappears and only works sometimes. After walking through the Paint Gun Activator on one of the maps. I found that if I looked at the floor, I couldn't paint, only if I was staring at the ceiling or aiming up above everything, would it fire, and only about 60% of the time did that work. The game is completely unpolished and is falsely advertising co-op. The main page states: Single-Player and Co-op Workshop Integration with Source Instances to create your own Paint Gun Maps.

It doesn't state


Yet they have this listed:


(NOPE, we fooled you..... you have to download the mods in order to get this feature. We aren't offering it, but we are stating it's here for you, just not through us.... because... well... we want money for a portal 2 workshop paint gun.)

Steam Cloud
Commentary available
Captions available
Partial Controller Support
Includes level editor
Includes Source SDK
Steam Trading Cards
Steam Workshop

I understand this game just came out on the 15th. So hopefully the developer pulls his head out of his a.s.s. and makes it co-op in the base game, and fixes the portal gun for the modders. It plays just like a damn early access beta game, and it's supposedly finished
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2 of 4 people (50%) found this review helpful
3.3 hrs on record
Posted: October 3
Almost as good as the original, some bugs here and there, a little short, but for 80 cents on sale a must-have for Portal 2 fans!

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1 of 3 people (33%) found this review helpful
Not Recommended
3.2 hrs on record
Posted: October 10
It's a nice game, but not too impresive, (three stars out of five).
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Recently Posted
3.1 hrs
Posted: October 23
The game exits to desktop after the intro videos
Helpful? Yes No Funny
{DNX} Midnoclose
6.6 hrs
Posted: October 23
This was worth every bit of my $5!
Helpful? Yes No Funny
6.6 hrs
Posted: October 21
The game is nice, don't get me wrong, but they couldn't add a feature as simple as loading different saved files... you can only load the LAST one.
- Good concept
- Most of the levels are ok
- If you are a Portal fan, it's definitely a must try

- Can't Load previous saved games
- Some leves are just annoying (not difficult, just annoying)
- The story makes no sense
Helpful? Yes No Funny
Ninja Master
5.5 hrs
Posted: October 20
This is worth the price, it makes you think and work faster
Helpful? Yes No Funny
Wibble199 『GB』
3.2 hrs
Posted: October 13
A great new idea that means you have to think differently to Portal 2. I enjoyed playing with the gels in Portal 2 and so I enjoyed using them in Aperture Tag.

Overall the story felt rather short and left me wanting more puzzles. I was able to finish the main campaign in about 2hr 30m. I picked this game up for about 80p and so it wasn't a big deal however I feel that if I were to pay £4 for this mod with compartively short gameplay compared to some other Portal 2 mods I would feel rather disappointed. I would recommend waiting for the product to come on sale before purchasing.

Another thing to be aware is that although the game has community maps avaliable, the game does not have an official co-op campign.

Some of the levels are recycled from the original game and you have to to a new approach to figure out how to solve them using gels rather than portals. There are a bunch of new levels and the environments are really well made. Towards the end of the game the levels have a theme to them, such as a forest theme with tree and wallpaper on the walls of the test chamber. That made a very nice change from seeing room after room made of the aperture science panels.

The narrator orb, Nigel, is the only character in the game you will meet. He's a fun, quirky character and the voice actor is rather good. You encounter him in person later on in the game and he follows you around on a track, which I found a rather neat concept.

Being able to utilise the level creator from Portal 2 and being integrated with the Steam Workshop means that there are a bunch of levels available to play besides the base game, which helps keep you amused for longer. I did not try the co-op community levels, but by the sounds of it they are a little buggy.

All in all a great mod, and I encountered very few bugs and no crashes, though I'd wait for it to come on sale before purchasing. 7/10
Helpful? Yes No Funny
11.8 hrs
Posted: October 13
[Might add more later]

Good mod, but the voice acting could be improved on.

My suggestion is that you get the mod on sale. I got it for 50 cents.

Voice acting 8/10
Music 9/10
Puzzle design 9/10

Helpful? Yes No Funny
0.9 hrs
Posted: October 13
The mod is not worth money... protal stories mel was fan fuken tastic and it was free... the mod is good, the puzzels are a bit too easy and the voice acting was ok but it is not worth money... i mean , when u see mods like (mel and thinking with time machine) that are free u cant just say that this mod is worth money..(i am sorry, this is my first negative review i ve done..)
Helpful? Yes No Funny
4.5 hrs
Posted: October 12
Now your thinking with Gel...Jello? Overall this game is pretty good and fun. But the 4th chapter, I just, really don't like it. The game has a problem where it feels luck-base, what I mean by this is that 90% of my Deaths from my game is beacause the Blue Gel had me Over/Under Jumped,which is fine, but chapter 4 made me hate the Paint Gun.Its good at the first 4 puzzles, but after the 4th puzzle the rest of the chapter 4 puzzels are just rage-inducing. Overall the rest of the 3 chapters are pretty neat, and overall fun. However, if I were the game developers, I would remove Chapter 4, The 3rd Chapter had a really climatic ending as well, unlike Chapter 4 which was completly the opposite. Get this game, but beware of Chapter 4.
Helpful? Yes No Funny
4.4 hrs
Posted: October 10
This game is frustratingly fun, it gets you thinking as did the other portal games.
Helpful? Yes No Funny