What are the 3 monthly competitions?

[King of riddles]

What are the three monthly competitions? I just could find the High Score Challenge.

[sgro]

Where do you see that there are three?

[SimTheSim]

First of, appropriate name.
I think you're looking for the monthly competition, which you can find under the tab "High Scores" in the link "Monthly competition" (above past records of the monthly competitions).
This competition is based on the score system which takes into account puzzle type, time, hints, etc. and is not subdivisionned in three or however more competitions, although I would love to see a puzzle type leaderboard.