Shiakaku of the Day (opens in new tab)

There’s a game on Apple Arcade called stitch if you want a much larger and more difficult version of this.

I don't understand how to make a rectangle of size 5.

There's a typo in the current title: Shiakaku -> Shikaku (Japanese for "square")

Typo in title, should be “shikaku” (Japanese for quadrilateral).

Of course Simon Tatham’s puzzle collection includes this one. He calls it “rectangle”. You can configure the game to leave spaces around the numbers, which increases the difficulty. There’s a web based version here: https://www.chiark.greenend.org.uk/~sgtatham/puzzles/js/rect...

If you like these kind of games, there are millions of them at https://puzz.link/db/

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I imagine master will take a couple of hours to complete, so I didn’t even attempt it.

This is great. Reminds me of the "Flow Free" game on the Apple App Store.

Thanks for sharing this, these are great for those 10 minutes break I set for myself between one task and another. Recently someone also shared a "Guess my RGB" game which serves equally well for this purpose

It occurs to me that a decent strategy on the large boards is to look for larger primes, since they are likely to only work one way

A small puzzle game that I find to be a reasonable pastime. Author has also done rabble.se but that is only in Swedish.

Congratulations, this is a great nerd snipe.

How long before someone makes the AI for this?