  We study and extend the duality web unifying different decoupling limits of
type II superstring theories and M-theory. We systematically build connections
to different corners, such as Matrix theories, nonrelativistic string and
M-theory, tensionless (and ambitwistor) string theory, Carrollian string
theory, and Spin Matrix limits of AdS/CFT. We discuss target space, worldsheet,
and worldvolume aspects of these limits in arbitrary curved backgrounds.
