  We construct a large family of exact solutions to the hyperbolic system of 3
equations of ideal granular hydrodynamics in several dimensions for arbitrary
adiabatic index $\gamma$. In dependence of initial conditions these solutions
can keep smoothness for all times or develop singularity. In particular, in the
2D case the singularity can be formed either in a point or along a line. For
$\gamma=-1$ the problem is reduced to the system of two equations, related to a
special case of the Chaplygin gas. In the 1D case this system can be written in
the Riemann invariant and can be treated in a standard way. The solution to the
Riemann problem in this case demonstrate an unusual and complicated behavior.
