[peterpuzzle]

Recently I designed a calendar puzzle with 10 tetris-like pieces. When you place all the puzzle pieces on the board, three squares/rhombuses are still open and together they form a date. Can you arrange the puzzle pieces in such a way that it shows todays date? See https://praxispuzzles.com/calendar_puzzle_rhombus Disclaimer: I sell these puzzles for a little more than the raw material.

[ewheeler]

Fun! Very similar to https://www.dragonfjord.com/product/a-puzzle-a-day/

[jpsouth]

I got this for my mother and she loves it, but it’s bloody hard some days! Great bit of kit though for any puzzle lovers.

[peterpuzzle]

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!

[peterpuzzle]

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.

[teraflop]

Very cool!

Unfortunately the interactive demo doesn't work for me (Firefox 143.0.4 on Windows):

> Uncaught TypeError: can't access property "inverse", this.puzzlemat.getScreenCTM() is null

[peterpuzzle]

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

[rawling]

Can you arrange them to make dates that don't exist, or is it designed so you can't?

[peterpuzzle]

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.

[xyzzy_plugh]

This is quite clever.

[malnourish]

I love this. Do you ship to the US?

[peterpuzzle]

Yes, I do ship to the US.