Very nice game. The ending was not completely satisfying, but adequate enough for a game of this proportion.
My playtime was somwhere in the range of 5-10 minutes, All puzzles were correct at the first attempt. Most time was spent reading the story (which was very nice). However, I teach Logic & Set Theory so I would advise you to not take my time into account.
4.5.....my head hurts...xD
I found a bug.... if you at IX turn arond the AND answers, you will have it wrong. That was so mean, so after a few minutes asking why in the hells name i could have it wrong i looked at the walktrough and saw that you have to turn around those -_-.
But I think the game needs a sequel. Why?
1. IF a game is awesome THEN it needs a sequel
2. This game is awesome
3. THEREFORE this game needs a sequel
Also:
1. IF you are good at math THEN this game will be easy
2. You are good at math
3. THEREFORE this game will be easy
I haven't come across a game as original as this one in quite a while! It was perfect, except for the fact that the last puzzle (number 10) is crazily-hard. I was only able to solve it when I started messing around with the arrow-keys and I saw the right answer.
You should definitely make a sequel to Ir/rational Redux, but I'd strongly encourage you to use a different type of drop-down menu, if that's possible, one where answers aren't occasionally hidden.
I promise, I will never use drop downs again. Believe me.
Really enjoyed the game. Unique and fun.