https://wccftech.com/mafia-3-is-now-free-to-play-and-75-off-on-steam-until-may-7th/

Mafia 3, the third chapter in the mobster-themed franchise, is now free to play on Steam until May 7th. The game already had a demo, but with this trial, you're free to play without limitations until that date.

Alongside the trial, there's also a 75% discount valid until May 7th. However, none of the DLCs released for Mafia 3 are discounted, so you'd have to purchase those at full price if you wanted to play them.