Haunted Legends: The Undertaker 

Haunted Legends: The Undertaker is a creepy hidden object game where your goal is to unravel a mysterious undead curse in a fishing village. You play as a quick-witted detective who's traveling to a damned community and uses his puzzle solving skills to get rid of the hoard of undead.

Like in many other similar games, you first need to create a player profile and choose the difficulty level (Casual, Advanced, and Hard). Afterwards, the app will display the prologue under the form of a high-quality video (you can skip this introductory clip if you want to).

On your journey you will interact with different characters who offer you guidance and additional info regarding to what happened in their village. All given information is collected within a journal that can be accessed whenever you feel it's necessary.

I also like the fact that you can always change the game mode (or difficulty level). What's more, your progress is automatically saved each time you move to another location or complete a challenge.

Briefly, I'd say it's worth buying Haunted Legends: The Undertaker. The game is filled with dozens of challenges, offers you plenty of useful hints, and is affordable.