You are playing point and click adventures, right?
I beat Heir of The Dog with no walkthroughs because each time I used a walkthrough it didn't count.The first time it was for a randomized puzzle so the answer didn't do me any good and I had to figure it out myself anyway. The second time it was verifying that the game had glitched and I wasn't just being stupid. The game had in fact glitched and I had to reset to solve the puzzle.