Unanswered Questions

The goal of Hidato is to fill the grid with a series of consecutive numbers adjacent to each other orthogonally or diagonally, and all tiles are required to be filled in. So, as you may or may not ...

Alisa completes a railway game set which allows us to make various closed railway routes with crossroads. It is need to put the “rails” parts in the kit, as well as four types of “crossroads”: corner (...

I'm starting to create a puzzle, but I'm going to need a cipher that will be impossible (or at least very difficult) to crack, but can be easily decoded with a key. I first looked at the one-time pad ...