Pitch improver is a set of excercises that will help you learn to play by ear. In every excercise you will start with the easiest tasks which will get more complex as your ear improves.

Pitch improver is designed to work on your weak sides. If you mix up two chords or intervals, the program will drill you with these particular types.

The excercises are:
-Repeating melodies (20 levels)
-Intervals recognition (11 levels)
-Perfect pitch (11 levels)
-Chord types (12 levels)
-Chord progressions (16 levels)

Some advice on training.
Practice everyday, but not for a long time, 20 minutes should be enough.
Melodic dictation will help you to hear melodic movements, while chord progressions excercise will let you recognize harmonic movements in songs. Don't forget the interval recognition excercise, it will find out the intervals you recognize worse than others and help you focus on them.