This often depends on the playstyle and the activities that players of Stardew Valley prioritize. Most of the time, these quests tend to be as simple as finding one item and delivering it to the character who requested it. However, some quests ask a little bit more from players. Some examples of the harder quests in Stardew Valley include The Mysterious Qi questline that asks the player to explore and solve puzzles. The Skull Cavern quest asks players to reach the 25th level of the Skull Cavern mines and the Goblin Problem questline acts as a quest that is as close to a traditional RPG questline that you will find in Stardew Valley.