Steam News has word that Activision has added five new titles to the service, and all five are on sale for 25% off between now and July 30. Aces of the Galaxy, TimeShift, and 3D Ultra Minigolf Adventures are now available, as well as Sierra classics the King's Quest Collection and the Space Quest Collection. Both Sierra collections list Windows 2000/XP as a system requirement, though The King's Quest Collection has a note saying "Some games in this collection may run under Windows XP 64 and Vista 32/64, but are not officially supported."