NiGHTS into Dreams and Sonic Adventure 2 will be released on October 2 for Xbox LIVE Arcade and PSN, SEGA has announced.
Each game is priced £6.49/800 MS Points.
As well as being given an HD makeover, both releases will include bonus interviews with the developers behind the games.
Sonic Adventure 2 will be expanded with the release of Battle Mode DLC for 240 MS Point/$3.00, offering maps and characters from the GameCube version of the game.
And NiGHTS into Dreams players will be able to access the Christmas NiGHTS expansion - originally only available through a Saturn holiday bundle or from special game and magazine promotions - for free.