I took some of my holiday time to re-read The Dark is Rising. It's still good. Shorter than I remember.
Prompted by nothing but the season, I began to wonder: what sort of game might be made of this book?
It must be twenty years since I last read through The Dark is Rising. It was written in 1973, long before fantasy -- much less children's fantasy -- became the battle-hardened marketing category we know today. The devouring gyre of media resurrection has almost entirely overlooked it. (The 2007 movie was reviled by absolutely everybody, as far as I can tell, and vanished in a knot of shame.)
So perhaps nobody has even considered the idea of transforming the story into interactive form.