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Jul 8, 2012 | 6:59 AM EDT
  • Daily 2nd Place July 9, 2012

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UPDATE 4 (8th September 2012): IR/RATIONAL INVESTIGATOR ANNOUNCED! /sharedfiles/filedetails/

UPDATE 3: ir/rational has made the front page with 45,000 plays in under a week! Thank you everyone - and keep your eyes peeled for announcements in the coming months!

UPDATE 2: Walkthrough available here: /2012/07/irrational-walkt hrough.html

UPDATE 1: Made 10,000 views and the Popular Games list in 24 hours! Thanks to everyone who's played!

Argue the toss in a twisted tale of logic...

In ir/rational you complete, create and discredit arguments by selecting propositions and filling in the blanks. It's a puzzle game based on propositional logic, and a graphic adventure all in one - only here you don't so much need to escape the room as prove why you'd even want to.

- Unique, language-based argument system: formulate logical proofs to progress through the game

- Dark philosophical comedy by Tom Jubert, writer of Penumbra, Driver: San Francisco and FTL.

- 10 screens and roughly half an hour of intelligent, challenging and inventive gameplay

- Musical score by award-winning composer Mikko Tarmia

My website:
My narrative design blog, Plot is Gameplay's Bitch:

- Click to progress story
- Complete the arguments by selecting options from the drop-down menus

NB Some systems don't display all the dropdown options at once, and you have to use the arrow keys to scroll.

If you can't see the right answer, chances are you can resolve the problem with the arrow keys. Hope it's not dampened your enthusiasm!



Rated 5 / 5 stars

For those confused on level 10, the arrow pointing in one direction is an IF statement (for example, if you have A -> B, you would read it as IF A, THEN B) and the arrow pointing in both directions is a bi-conditional (for example, if you have A <-> B, you would read it as IF AND ONLY IF A, THEN B). This game really helps if you had a 'Proofs' class in college! BTW, it was also amazing! Very challenging at times even though I did have prior knowledge on the concept. If only my Proofs class had been this much fun...


Rated 5 / 5 stars

I've just finished studying Computing at school, so this was very fun to do. I'd love to see how the story continues. From the only objects that were actually in the room, it seemed a bit steampunk. I'd love to see how this continues in a sequel (even if your objective was to show calculus).


Rated 5 / 5 stars

Nice game, really original. I loved it that everything was logical. It would be nice if you would make a second part of this:)


Rated 4.5 / 5 stars

Is it possible that you would make another of these? After completing that I reason that you wont, but it would be really cool if you followed it up with a totally different style of game, like a point and click in the same setting, assuming perhaps the gas didn't work or the machine knocked you out to remove organs and then eject you into the outside world; whether it be apocalyptic, in space or otherwise. Or maybe you don't provide a reason for the character's survival.


Rated 3 / 5 stars

i fail to understand the logic in the first and second puzzles... for the first puzzle there is no evidence to prove that the switch is even a switch, or that it will turn the lights on if there even is lights. in the second puzzle the flaw is that just because people believe a perfect god exists doesn't mean they are correct using an example from atheism such as the invisible pink unicorn. other than that the puzzles were creative but not that challenging except for the last one that has no key for the double arrow. overall a decent game with good music and artwork, i really wish there was more logic puzzles like this and that is your redeeming quality. 3/5 id like to see more with this theme.