  A hyperk\"ahler manifold $M$ has a family of induced complex structures
indexed by a two-dimensional sphere $S^2 \cong \mathbb{CP}^1$. The twistor
space of $M$ is a complex manifold $Tw(M)$ together with a natural holomorphic
projection $Tw(M) \to \mathbb{CP}^1$, whose fiber over each point of
$\mathbb{CP}^1$ is a copy of $M$ with the corresponding induced complex
structure. We remove one point from this sphere (corresponding to one fiber in
the twistor space),and for the case of $M = \mathbb{R}^{4n}$, $n\in\mathbb{N}$,
equipped with the standard hyperk\"ahler structure, we construct one
quantization that replaces the family of Berezin-Toeplitz quantizations
parametrized by $S^2-\{ pt\}$. We provide semiclassical asymptotics for this
quantization.
