Originally developed for the Sega Dreamcast, Sonic Adventure 2 is now available on Gabe Newell’s digital platform for $9.99. In addition, the add-on content pack that debuted on the Xbox Live Arcade and PlayStation 3 versions of Sonic Adventure 2 (also known as Battle Mode) is also available on Steam. It’s worth noting that Battle Mode, which features six additional characters and 21 two-player battle maps taken from GameCube’s Sonic Adventure Battle, is available separately for $2.99.
Additionally, Sonic Adventure DX is also available on Steam so those in need to catch up with some of the Sega Dreamcast’s most popular titles are in luck. Sonic Adventure DX costs $8.99.
Furthermore, some sources have stated that the high-definition version of Nights might be coming to the digital platform as well (both Nights and Sonic Adventures 2 were announced as part of the Sega Heritage Collection.) While the PC version of Nights was announced a while ago, a proper release date was never confirmed.