Two first chapters are very easy. But in the middle of the last chapter things get harder, too hard in my opinion. Wandering the city streets (many almost identical locations) looking for a museum is a nightmare. Inside the museum there is more of the same - wandering through identical dark passages. Adjusting the clock with repeating the same command many times is off-putting. The closer to the end of the game, the less enjoyable it becomes. My rating: 5/10.