Escape from Ravenhearst - Morphing hidden objects.Dire Grove - Full motion videos, 3D animation.Return to Ravenhearst - Cause and effect objects, adventure gameplay, and live actors.Madame Fate - Word puzzles (of which there are many), hidden object scenes inside of hidden object scenes / interactive hidden object scenes, and morphing objects.Ravenhearst - Rube Goldberg type door puzzles.Prime Suspects - Flashlights and a fictional X-ray device.
After Huntsville, each one added additional features including: There have been 20 games in the Mystery Case Files main-series to date, with 4 tie-ins/spin-offs.