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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

To get missing options, press the down key while menu is open


Rated 5 / 5 stars

i enjoyed the game!


Rated 5 / 5 stars

This game is awesome! It uses propositional calculus but makes it entertaining! Bravo!


Rated 4.5 / 5 stars

A Brilliant mind boggling game. I did have a few problems as many other people have, with level 7 and 10 with the missing option in the drop down bar.
DO NOT USE CHROME apparently that is the source of the problem and works on different browsers


Rated 4 / 5 stars

Good game but Christ are those last few questions complex. Some of the grammar and semantics don't match up in the dropdowns which makes it VERY hard to construct the answer. The machine logic question essentially being one statement and then a mess of dropdowns with little to no connectivity doesn't help much. Really disappointed it came to that in the end.