One more!

Yes. One more! is free to play on Steam, so there is nothing to buy to start playing.

The minimum requirements for One more! are: Windows 10, Intel Core 2 Duo, 200 MB storage. It runs on Windows only. The recommended specs are in the System requirements section.

No. One more! is a single-player game.

Mostly, yes. Valve rates One more! as Playable on the Steam Deck: it runs, but may need some manual setup.

Yes. One more! is the full base game. You need nothing else to play it.