A portal that sends the subject to any time.
The subject indefinitely experiences the same set of events over a set amount of time.
A window in the fabric of spacetime opens up wherein the subject can see a setting based in another time.
Lucid Dreaming Time Travel
The least convincing type of time travel where the subject lucid dreams about another time. Reportedly most popular with SoS.
Retro Causation Subjects in the future affects events in the past.