Toyman (Dumarest Saga 3), by E.C. Tubb, paperback science fiction novel
“The planet Toy was a bauble of a world, designed for the pleasure of those who owned it. It was founded long ago as a corporate Utopia, and had the oldest computer banks in the Galaxy.
Now Toy was in the hands of a decadent young Toy Master, whose greatest pleasure was the pain of others.
Dumarest had come to Toy to consult the great Library, in hopes of locating long-lost Earth. He stayed to fight for his life.”
The NEAR MINT condition copy is a 1984 printing (the one with the orange cover). The VERY GOOD condition copy is a 1973 printing (the one with the mostly black cover).