Another one of my favorites I've made.
Rules:
-Normal sudoku rules apply.
-Cells with a grey circle contain an odd digit.
-Digits in a killer cage cannot repeat, and all killer cages have the same sum (to be determined by the solver).
-HOWEVER, some of these killer cages are frauds and are actually whisper lines/loops. Adjacent digits along a whisper line/loop must differ by at least 5. Digits may repeat in fraud cages, and if the 2x2 cage is found to be a fraud, it's an O (ring) -shaped whisper loop.
-Just for clarification, no cage can be both a valid whisper line and a valid killer cage.
Links:
F-puzzles
CTC
