Continued from the "what is "robilar's morbis tastes"?" thread in the Robilar Remembers forum.
Once my players get a few levels under their belts, in between the whole party campaign adventures, I'll let the players dictate party size and composition. Rather than having the party summoned by some instigator, I pick a certain character, pass the info on to him, and then let the player decide how to approach the adventure. Many times the player will try the adventure alone, and it's in such situations that I've had some of my most memorable games. One character, The Supernal Cedric Magno, High Priest of Saint Cuthbert (Order of the Billets), was especially good. He was the only one who knew how to run away. And while none of my players were known for subtlety or stealth, he was probably the best of the bunch for not attracting undue attention. For other players solo adventures were often the end of the line. They'd keep trying them anytime they got the info first, but in short order the enemy would be buzzing and responding like an agitated hornets' nest, and the players would slug away regardless of how bad things got.
I have a few solo adventure Greyhawk memories that I'll post shortly.