Lovely IPC! My first one where I could finish the rounds. Thanks to the organizers and everyone who contributed the content.

My favorites:
R1: Heterocut by Murat, Pentominous by David, Pento Loop by Chiel, Magic box by Prasanna
R2: Kakuro by Chiel, Scrabble [Points] by Prasanna
R3: Five Cells [Kurve] by Chiel, Nanro [Kurve], Fillomino [Kurve] and Rail Pool [Kurve] by Prasanna
R4: Criss Cross Count and Pento Roll 2