Some of the earlier games like Mystery House, Wizard and the Princess and Cranston Manor, have been released with more different cover art variations than you'd care to know. SierraVenture and SierraVision had an older Sierra On-line type logo employed on the back of the box, on the disk labels and the disk sleeves, and all of it was dumped around 1984, when Sierra employed a new Sierra logo, the more familiar one, and began packaging their games in grey boxes with plastic trays. In 1987, they began using the thin slipcover case. A standard two piece tan box with the Sierra mountain logo on it and a slipcover with the game's artwork. The two-piece box itself was plain white.
Hint books are available for at least some of their games.
All the SierraVenture games were written using different frameworks. Starting with King's Quest, Sierra started using a common interpreter called AGI which made their games much more portable. They are or have been distributed by All American Adventures and IBM . They distribute Dynamix and Coktel Vision . For more information, see Dynamix , Yosemite Entertainment and Codemasters .