  Dark matter scenarios are being tested at the LHC in the general-purpose
experiments through promptly decaying states. In parallel, new dedicated
detectors have been proposed for the LHC to probe dark matter portal theories
predicting long-lived particles that decay away from the interaction point:
MoEDAL-MAPP, MoEDAL-MALL, FASER, SND@LHC, CODEX-b, MATHUSLA, AL3X, ANUBIS,
FACET, milliQan, FORMOSA. In addition, the SHiP beam-dump experiment is planned
to operate with the SPS beam to extend the discovery reach for such particles.
The detector design and expected physics sensitivity of these experiments is
presented with emphasis on scenarios explaining the nature of dark matter.
