If anyone wanted a new Dreamcast game to play online, Driving Strikers will be release in a month. You can pre-order this game at a early bird price of £19.99/$19.99 This game will support both Dial-Up (DreamPi) and Broadband. This game supports up to 4 players local and online
https://www.wavegamestudios.com/shop/driving-strikers