Site-specific theatre pioneers Punchdrunk have challenged audiences to reconsider their viewing experience. Wandering through performance spaces and mingling with loitering actors, we the paying customers are no longer passive consumers.

Slung Low, this year’s winners of the Oxford Samuel Beckett Theatre Trust Award for experimental work, elaborate engagingly on these themes. Yet ultimately Helium proves stronger on the theory than any dramatic substance.

The Pit has been transformed into a series of large boxes that we enter singly to encounter performers or recorded voices. Thrill as we do at this novel combination of solitude and proximity to the action, the narrative is overly elliptical and, at just 30 minutes, frustratingly truncated. Given time, we might come to care about the enigmatic life of wartime fighter pilot Max, which his granddaughter attempts to piece together from his diary as the old man lies dying. However, the gaps between the dots we are asked to join are too great, and being given a (partially) explanatory booklet when we exit feels like a cop-out.

Helium, until 20 September (0207 638 8891).