He expressed many other concerns in his letter, many of them prosaic. He must be supervised while shaving and brushing his teeth, he complained, and because of the “mental strain” this causes he is forced to limit those activities to once a week. Nor is he permitted to keep hydrating skin cream in his quarters, which are drab and without a view, he wrote. Switches for his lights and television are outside his suite of cells, obliging him to summon guards to turn them on and off.

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Mr. Breivik dislikes handcuffs, too, because the steel edges cut into his wrists, and he dreads putting them on for each trip outside his cell, Verdens Gang reported. Without a thermos, his coffee frequently goes cold, according to news media reports.

Furthermore, he wrote, his phone calls and mail are unfairly censored. “His freedom of speech is being violated,” Mr. Jordet said.

Only correspondence from “New Testament Christians and other people who do not like me” has reached him in recent months, Mr. Breivik wrote.

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Letters aside, Mr. Breivik would like to pursue his literary ambitions while in prison, he said, but those aspirations are being thwarted by the stab-resistant safety pen he has been provided, “a nightmare of a tool” that causes his hand to cramp. The pen is “an almost indescribable manifestation of sadism,” he wrote, though presumably it did not prevent him from composing his lengthy letter of complaint.

A prison spokeswoman said Mr. Breivik was given an electric typewriter on Friday. It was not given in response to Mr. Breivik’s letter, the spokeswoman said, according to The Associated Press.

“I highly doubt that there are worse detention facilities in Norway,” Mr. Breivik wrote.

Mr. Breivik’s 21-year sentence is the country’s maximum, and he is considered the most heinous offender in modern Scandinavian history.

Mr. Breivik confessed to setting off bombs in downtown Oslo in July 2011 before shooting dozens of people at a summer youth camp run by the Labor Party. He said the killings were intended to protect Norway from Muslims and multiculturalism.