I don't believe there is a thread yet for INTPs to discuss various puzzle games that fuel their Ti-Ne preference. Maybe it's just me, but on a boring day I can usually be found on the interwebz playing with different types of puzzle games. It's very troublesome when I don't have some form of puzzle to solve.
My personal favorites are the ones in which you must navigate through obstacles to get the exit. (narrows it down a lot)
Orbox: Orbox online flash game logic puzzle
Probably one of the best. It starts getting a bit complicated around level 13. I find the difficulty level to be just right for an enjoyable puzzle. There's also a 'B' version.
Bloxorz on addicting games is pretty cool too.
I'd love to hear some other puzzles that fellow INTPs (or others) have enjoyed.