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We study the multiloop amplitudes of the light-cone gauge closed bosonicstring field theory for $d \neq 26$. We show that the amplitudes can be recastinto a BRST invariant form by adding a nonstandard worldsheet theory for thelongitudinal variables $X^{\pm}$ and the reparametrization ghost system. Theresults obtained in this paper for bosonic strings provide a first step towardsthe examination whether the dimensional regularization works for the multiloopamplitudes of the light-cone gauge superstring field theory.

Multiloop Amplitudes of Light-cone Gauge Bosonic String Field Theory in Noncritical Dimensions