Can you find the first digit of 2^2^2^2^2^2^2? (Basicly,it is $2$ to the $2$ to the $65536$ power) You cannot use a computer,but allowed to use a calculator. Good luck!

This puzzle is part of the Puzzling Stack Exchange Advent Calendar 2023. The accepted answer to this question will be awarded a bounty worth 50 reputation.< Previous Door Next Door > This puzzle is a variant of Thermometers, but with peppermint sticks! The goal is to shade some (or no) cells on e...

I created this puzzle today: PEMONNOTEA US …. … ..h The puzzle above wants you to fill in the blanks

Box 1: April, June, September, November. Box 2: March. Box 3: January, May, July, August, December. What should be in box 4, and why?

So, for my thesis work, i need to compute the entanglement entropy from a BCS-BEC crossover. That is, basically standard BCS theory, to which one adjusts the coupling such to accomplish a crossover from BCS regime to a Bose Einstein condensation (Cooper pairs behave as point bosons). All this is ...

I just found a weird-looking sudoku I left years ago in my basement: I think there was a specific name for this type of puzzle, but I forgot to write it down and now I can't remember it! The only other thing I found is a message on the back of the puzzle saying that every possible circle has be...

What is the thing behind the question mark doing?