peterpuzzle

Creator here. I sometimes advise people not to focus on today's date, but a date in the following week. Then you have more time to find a solution!

Creator here. I know, I know, the "rhombuses" are just rotated "squares", but I already had a calendar puzzle "Square", so that's why.

Creator here. If there is enough demand I can make a French version. Ordering a new batch of lasercut wood cost me $20, so I have a minimum batch size of 20.

Creator here. That puzzle started my search into this type of puzzle. But in the end my puzzle is harder, because it also contains the day of the week and has the most "irregular" puzzle pieces possible.

Actually I tried a lot of different combinations of piece shapes to find the "hardest" set of pieces that can still solve all possible dates. "Hard" is subjective, but I mean pieces with multiple protrusions.

I wrote 2 solvers in Python. One that loops through all possible dates and searches for a solution. And one that loops through all solutions and checks if they form a date or not. And luckily both gave the same answers.

Learn to write effective unit tests using Test-Driven Development and Mutation Testing.

This game is written by me, a developer who wants better software. Good software is at least thoroughly tested by the developers. Testing software is a skill and this game helps you learn just that.

I am also a computer science professor at a university of applied sciences and I see many students and (junior) developers struggle with the concept of unit testing and writing enough (more then 1) and effective tests per unit (function). The game teaches them Boundary Value Analysis without mentioning it.

I am open for constructive feedback.

Creator here. No, you can arrange the puzzle pieces to make dates that don't exist, like Monday February 31. Actually there may be "impossible" dates, because I didn't check for them, but I guess all combinations of days of the week, day of the month and month are possible. And also many non-dates, like 1, 2, 3. But good point: alle possible dates have at least 1 solution. Disclaimer: I sell these puzzles for a little more than the raw material.

Fixed. On some puzzle pieces there is still a small offset in Firefox, but I can't find the reason...

I sometimes advise people not to focus on today's date, but a date in the following week. Then you have more time to find a solution!

You are right. This puzzle started my search into this type of puzzle. But in the end my puzzle is harder, because it also contains the day of the week and has the most "irregular" puzzle pieces possible.

You can arrange the puzzle pieces to make dates that don't exist, like Monday February 31. Actually there may be "impossible" dates, because I didn't check for them, but I think all combinations of days of the week, day of the month and month are possible.

Yes, I do ship to the US.