  Nanobubbles wield significant influence over the electronic properties of 2D
materials, showing diverse applications ranging from flexible devices to strain
sensors. Here, we reveal that a strongly-correlated phenomenon, i.e., Kondo
resonance, naturally takes place as an intrinsic property of graphene
nanobubbles. The localized strain within the nanobubbles engenders pseudo
magnetic fields, driving Landau quantization with degenerate Landau orbits.
Under the Coulomb repulsion, the Landau orbits form an effective
$\mathrm{SU}(N)$ pseudospin intricately coupled to the bath via exchange
interaction. This leads to novel Kondo behaviors with a new flavor screening
mechanism. The resonance here exhibits an unparalleled tunability via strain
engineering, establishing a versatile platform for exploring novel correlated
phenomena beyond the scope of conventional Kondo systems.
