Here is the collection of hardest themes and Puzzles.

Theme 1: middlegame
Theme 2: endgame
Theme 3: verylong
Theme 4: supergmgames
Theme 5: quietmove
Theme 6: zugzwang

Prizes

Champion 1$
Top 2 player 50 INR
Top 3 player 40 INR Top 5 player 25 INR
Top 6th to 10th 15 INR
Top 11th to 20th 10 INR
Claim your prizes