Sega is giving away Steam keys for the Dreamcast era game Sega Bass Fishing here: https://games.sega.com/bassfishing/?lang=en

You have to verify your email which will sign you up for their email newsletter and they aren’t going to send out keys until Aug 1. But still free game!

The game has a Platinum rating on ProtonDB and I’ve read that the Dreamcast Fishing Rod unfortunately won’t work with the Steam version very well due to how the rod is set to emulate the analog stick. It makes the menus impossible to use.