Quests
Quests start when you explore the Overworld. Complete all your quests and pass the gatekeeper to win the game.
How a quest starts
A quest icon appears in the status bar when a new quest is ready. Quests start at level 2 and above and then at regular intervals. Exploring outside makes them start sooner. Dark tiles at the edge of the outside world are where they begin so head for the fuzzy border.
Quests do not start while you are in a cave.
Finding your way
NPCs tell you what is needed to finish a quest. Red compasses appear around the map and on the globe to lead you there. When the quest is done follow the compass to an exit and on to the next thing.
Failing
You might fail a quest. If that happens keep exploring to find another one.
Side quests
Exploring the depths of caves can trigger a side quest. You may have to go even deeper or find a sacred relic. Completed side quests count toward your total.
How many
Win three quests to pass the gatekeeper. On easy difficulty one is enough. When all quests are finished the gatekeeper beckons with a purple compass. The longer you take the harder the world becomes so do not dawdle.
The Quests section describes every quest the world can set you.