A lineverse is a universe that has been crushed into a 1-Dimensional Space. In a lineverse, everything is reduced to a series of one-dimensional objects on a single line, which may or may not experience time dimensions as well. It is unknown if life or intelligence can arise with only one spacial dimension.
It may be possible for lineverses to have multiple temporal dimensions, which would be very effective for studying how the timelines (timesquare?) interact.