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At this point, I've not built anything into the mechanics to directly support solo play, and I haven't really considered any plans to do so later.  There aren't very many mechanics in the game that are fully dependent on there being a GM or multiple players, though, so I suppose you could make it work — you'd probably just have to do a lot of the work building the narrative on your own.

As the core system of Shatterkin is derived from the Blades in the Dark system, however, you might look at the game "Alone in the Dark" for ideas for how you could run Shatterkin solo.