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 (1,646 reviews) - 76% of the 1,646 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

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Recommended By Curators

"Aperture Tag: The Paint Gun Testing Initiative is a Portal 2 Mod but for money."
Read the full review here.


“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
Helpful customer reviews
117 of 181 people (65%) found this review helpful
6 people found this review funny
1.1 hrs on record
Posted: August 2
It's an insult to charge money for this mod, when larger, infinitely better mods (Portal Stories: Mel) are available for free. Further more, I found this mod frustrating more than anything else. On the last puzzle I tried I had to try a jump about 30 times before finally making it. I've played about a hundred different community levels for Portal 2, so I know my way around the game. When a puzzle is so finely tuned to doing an action within a few milliseconds in order to succeed, I find it more frustrating than fun. This mod was just frustration upon frustration, without a single element of actual fun. It's definitely not worth the money, and it became the first game I've actually requested a refund for.
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35 of 50 people (70%) found this review helpful
24 people found this review funny
4.7 hrs on record
Posted: July 21
Nigel sounds like one of those 14 year old let's play youtubers.
Other than that, it's great.
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13 of 17 people (76%) found this review helpful
4 people found this review funny
8.2 hrs on record
Posted: July 15
I like that I get to use the gels in this mod. It's a nice change from portals :P.

A lot of people say this mod isn't good or worth buying but I think it is. You get to use gels instead of portals to solve puzzles or just paint the rooms different colors.

Solve puzzles with your Co-op partner or send them flying while they're afk :P. Sadly there is no Co-op story mode just singleplayer. But you can do Co-op with chambers that other players made.

I rate this Mod 8/10.
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5 of 5 people (100%) found this review helpful
1 person found this review funny
3.7 hrs on record
Posted: November 20
I wasn't planning on getting this game until one of my friends gave me a -90% Coupon that's only 50 Cents.
Got back my 50 cents by selling 3 card drops that i got.

The game is kinda easy at the start but also confusing later on it gets harder.
I don't play a lot of Puzzle games because i don't like playing hard(thinking) types of games but this one wasn't that hard for me.
Still a very good game to kill some time when ur bored.

I recommend getting it when it's on sale not buying it for 5 Euros because i don't think that this game is worth that much. I pretty much got it for free and i enjoyed it.
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6 of 7 people (86%) found this review helpful
1 person found this review funny
17.7 hrs on record
Posted: September 25
Aperture Tag is a very curious mod for Portal 2 that replaces the dual portal device with a specially designed paint gun that fires the two main types of gels: Repulsion (blue) and propulsion (orange). This shift in focus turns the game into a messy, but addicting style of gameplay.

From start to finish I had a blast using a gun that shot gel everywhere, and in limitless supply! There were points in the game when I just felt like coating the chambers with as much gel as possible, which indirectly served as a great venting technique to safely let out my frustration when I found myself stumped with a hard puzzle. I also enjoyed the transitions between maps; there's just something whimsical about riding vacuum tubes and getting a good look at the facility on the outside. I also liked the addition of the backdrops in the final set of levels, which definitely helped break from the monotony of the worn out and dilapidated industrial scenery that we've seen plenty of in the official Portal games. And lastly, the creativity of some of the maps were a real joy. Shooting turrets with blue gel, transferring gel through excursion funnels, not to mention those wicked half pipe turns with the speed gel, these were all some very cool mechanics.

Now as much as I loved playing this mod, the game still had a couple of things that bothered me. First and foremost is that this fan-made mod costs money to play, but in all honesty I don't think that's really too bad since the price is fairly cheap and well worth the price. And my other qualm was Nigel. Nigel was... a very drab core to interact with. Not because of his personality, but because his Voice Actor clearly didn't put much passion behind the role, which definitely hurt his character.

Overall though I thought this was a fun mod to play, and the negative points pale in comparison to the enjoyment I had out of it. Aperture Tag proves to provide a fun and unique twist to the beloved Portal series that will keep your attention all the way to the end.
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