I made the site a few years ago, but I've refined it and added some features over time. Hopefully it's worth another mention!

Fun game, reminds me of the numbers round of Countdown. I would love to be able to use keyboard shortcuts instead of having to click.

Neat! Reminds me of 8 out of 10 cats does countdown. Only note is it’d be nice if the prior “yellow” square would be auto-injected if you click an operator when there’s no number on the left cell.

And maybe if it had more “big” numbers, the expert mode is still pretty easy.

Fun little game. How does the engine know that a solution is optimal?

Love this, I’m adding it to my daily rotation.