  Localized electrons subject to applied magnetic fields can restart to
propagate freely through the lattice in delocalized magnetic Bloch states
(MBSs) when the lattice periodicity is commensurate with the magnetic length.
Twisted graphene superlattices with moir\'e wavelength tunability enable
experimental access to the unique delocalization in a controllable fashion.
Here we report the observation and characterization of high-temperature
Brown-Zak (BZ) oscillations which come in two types, 1/B and B periodicity,
originating from the generation of integer and fractional MBSs, in the twisted
bilayer and trilayer graphene superlattices, respectively. Coexisting
periodic-in-1/B oscillations assigned to different moir\'e wavelengths, are
dramatically observed in small-angle twisted bilayer graphene, which may arise
from angle-disorder-induced in-plane heteromoir\'e superlattices. Moreover, the
vertical stacking of heteromoir\'e supercells in double-twisted trilayer
graphene results in a mega-sized superlattice. The exotic superlattice
contributes to the periodic-in-B oscillation and dominates the magnetic Bloch
transport.
