Time Clickers

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

The minimum requirements for Time Clickers are: Windows XP, 512 MB RAM, 150 MB storage. It also runs on macOS. The recommended specs are in the System requirements section.

No. Time Clickers is a single-player game.

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

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