You're just getting smarter.

Tell your friends, puzzling on calcudoku.org increases your IQ

Well, it seems like all of us subscribers already won the lottery today
Even the non-subsribers are pretty lucky as well, what with today's difficult 6x6 and medium 8x8 being accessible to everyone
Hopefully some of them will get hooked and buy a subscription


Now officially confirmed

Not wishing to be a downer, but doing calcudoku also slows down the rate at which your brain declines as you get older.

At least, I think it does!

You're going to feel positively rejuvenated after solving today's difficult 9x9
I subjectively felt like being on the verge of circular reasoning at many points, yet there always appeared a nice, logical path forwards, especially in the 6x and 168x cages at a late stage.
A most enjoyable puzzle

Did you click the "+" "like" button afterwards?

(I could check, and I'm not doing anything with this info at the moment, just curious)

I did, but then I probably do that after far too many puzzles for it to be actually useful in case you want to do something with it at some point
Also, it's probably too dependent on my form/mood on any given day whether a deserving puzzle gets a "like" or not
This is part of the reason why I sometimes express my approval of a particularly enjoyable puzzle through a post

Tuesday (or Monday for me) 8x8 hard is probably my favorite. I am quite sad, I never get `|` operator as a bonus puzzle :(
All kinds of doubles.
All 10x10. Sometimes I get a Friday one, but turned 90 degrees bonus -- much more enjoyable than constant 5x5 doubles with 0, which are mechanically solvable.

On the contrary Tuesday 9x9 are one of the least enjoyable for me and I force myself to solve one once a year to get the achievement (when I am really bored, I might solve it more than once).
And 6x6 hard where there is a central crosshatch pattern -- I probably miss some technique, but my solution rate for those is probably 50-60%, while all the other 6x6 patterns 100% of started.