Sign up to the 60th anniversary celebrations and claim a free Steam copy of the SEGA Saturn cult classic NiGHTS into Dreams when you link your Steam account (while codes last).
Once you sign up and link your Stream account, you get the following message;
NiGHTS into Dreams has been successfully added you your Steam Inventory. Check your Steam Library to download & enjoy the game.
Checked my steam library and it was there straight away.