Erm, I handt really thought about it. The game is designed for group play from the ground up.
However, I have never played solo table-top games. What sort of things do you look for in a solo game? I quite like Space Hulk, which is basically a solo game: its hard to beat the genestealers. Is this the sort of thing you look for, a strong scenario, where it takes good tactics to complete, like a video game?