How many levels are in LEGO Batman: Legacy of the Dark Knight?
Around 29 named story missions across the Prologue and 6 chapters. Source counts vary from 21 to 29 depending on how hub objectives are counted.
Outlets disagree because hub objectives like Tricorner Investigation, Wayne Industries and Tumbler Chase are sometimes counted as missions and sometimes as open-world steps. Push Square and Beebom group everything into roughly 21 missions; GameRant, Eurogamer and Sportskeeda count 29. The chapter shape itself is fixed: Prologue (7 missions), Ch.1 (8), Ch.2 (9), Ch.3 (9), Ch.4 (6), Ch.5 (5), Ch.6 (3).