Occasionally, Xbox hosts "Free Play Days" where the full game is available to download and play for a limited time at no cost.

Subscribers to Xbox Game Pass can download and play the full version on both PC and console as part of their membership.

An Android APK version is often listed as free-to-play, though features like multiplayer may require an internet connection. Game Features Descenders - Steam Community

Steam has previously hosted free weekends, allowing players to experience the complete game for a few days before deciding whether to purchase it.