We study π°π©2 and π°π©3 global conformal blocks on a sphere and a torus, using the shadow formalism. These blocks arise in the context of Virasoro and π²3 conformal field theories in the large central charge limit. In the π°π©2 case, we demonstrate that the shadow formalism yields the known expressions in terms of conformal partial waves. Then, we extend this approach to the π°π©3 case and show that it allows to build simple integral representations for π°π©3 global blocks. We demonstrate this construction on two examples: the four-point block on the sphere and the one-point torus block.