To run the project execture

make run

The project has been divided into client and server in order to test the funcionality using the client in a browser.

Ideally it would have test (unit, integration, acceptance, e2e, cdc, ...) but time limitations made it not possible.

For the WS management I've decided to use socket.io for bot the client and the server, given it provides some built in functionality, like rooms which made the task easier.

The client is a Create React App instance with redux in order to manage the state

A simple WS server on top of socket.io and the native http node library. For a prodution scenario something like express would be needed in order to server the static files for the client which will replace the http server to be resued by the WS.

Error handling wasn't implemented due to limitation of time. Testing wasn't implemented due to limitation of time. The storage service is intentionally in memory because it's easier to implement for this use case but could be easliy moved to redis or something like that.

Start the application using make run, click the Start a new game button, open that same url in a another tab / window / browser and start revealing squares in both, both tabs should be in sync.

It wouldn't be difficult to create a list of active games in the Homepage so the users could join one if they want to.