You can play the game here: https://tn1ck.gitlab.io/numbers-game/.
This game is known under various names: Zahlenspiel, Numberama, Take Ten, Seeds or Numbers.
I wrote this app originally in the winter of 2014/2015 initially with jQuery, then I used it to learn React. In 2017 I modernized it, so it doesn't rot away. When you want to check out the older versions, you can find them in the branches. It's a nice piece of history.
Tested with node.js 22, but should run with previous version as well. See nodejs.org for install instructions. If you have it installed, run npm install to install the dependencies and npm start for local development, it will start a server at port 3009 e.g. http://localhost:3009. Run npm build to create the production build.