The coding coach
Hints that go one step at a time, so you still solve it yourself.
Five hints, in order
Stuck? The coach helps one step at a time: Nudge, then Approach, then Pseudocode, then Fix mine (it points at what is wrong in your own code), and finally Solution. Take only as much help as you need.
Free includes the first two hints, 15 a month. Pro adds Pseudocode and Fix mine, plus asking the coach questions and having it review your code — 300 a month. Pro+ adds the full Solution, with 900 a month.