Unanswered Questions

Does anyone happen to know a name for this traditional(?) number square puzzle/game? The puzzle has a board of 10x10 squares that are initially empty. The player starts the game by entering the number ...

I have two gears with different numbers of teeth (20 and 10): The small gear makes two turnovers, while the large gear makes one turnover only. My idea is to use a large gear as an alphabet wheel (...

Background. I'm specifically interested in how to design a puzzles chain for a team (8-10 teenages). We are going to play at a Scientific Museum. The main the idea is to find a key and open a lock. ...

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 ...

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 ...