Dice

Yes. Dice is free to play on Steam, so there is nothing to buy to start playing.

The minimum requirements for Dice are: GeForce GTX 460, Intel Core i3-530, 512 MB RAM, 75 MB storage. It runs on Windows only. The recommended specs are in the System requirements section.

No. Dice is a single-player game.

Yes. Valve rates Dice as Verified on the Steam Deck: it runs well out of the box.

Yes. Dice is the full base game. You need nothing else to play it.