I played this once in '94 and don't remember getting stuck very often by the puzzles then. Now, much older, I'm replaying it and I got stumped at a lot of things: getting clay at the crime scene, unlocking grandpa's clock, drawing the right graffiti at the cemetary, opening the window at Schloss Ritter to get snow, using the vines to escape the zombies, and quite a few others. Senility is one reason, of course. But it also seems to indicate that adventure games back then were harder. The puzzles were trickier, and you actually had to select the action (look, take, open, use, etc.). I'm replaying a lot of older adventure games like Monkey Island and Days of the Tentacles and they all seem much harder than today's counterparts. But then again, back then adventure games were mainstream franchises as opposed to being a niche/independent genre today.