Just a thought: Replay Value of Adventure Games

You play the adventure game again to make a different choice to get a different outcome, collect Easter eggs, collect points or collect awards.

Such adventure games with replay value are:

The Legend of Kyrandia Book Three: Malcolm's Revenge

Mata Hari

Memoriam Mori

Nancy Drew game series

Sierra Adventure Game Series (King's Quest, Quest for Glory, Leisure Suit Larry, Space Quest)

Just a thought...