  We investigate the general structure of mirror symmetry breaking in the Twin
Higgs scenario. We show, using the IR effective theory, that a significant gain
in fine tuning can be achieved if the symmetry is broken hardly. We emphasize
that weakly coupled UV completions can naturally accommodate this scenario. We
analyze SUSY UV completions and present a simple Twin SUSY model with a tuning
of around 10% and colored superpartners as heavy as 2 TeV. The collider
signatures of general Twin SUSY models are discussed with a focus on the
extended Higgs sectors.
