"I highly doubt that there are worse detention facilities in Norway," the right-wing extremist, who killed 77 people in a bombing and shooting frenzy in July last year, wrote in the letter to Norway's correctional services, according to tabloid Verdens Gang (VG).

One of Breivik's lawyers had revealed on Thursday that his client believed his prison conditions "breached human rights".

In excerpts from the letter quoted by VG, the 33 year-old, who is being held in near complete isolation at a high security prison outside Oslo after being sentenced in August, outlined a catalogue of complaints that ranged from everyday annoyances to more serious issues.

Breivik said he was not getting enough butter to spread on his bread, was having to drink his coffee cold and was not able to keep a moisturizer in his cell, which, to his dismay, is sparsely decorated and has no view.

He also complained that the handcuffs he has to wear when being transferred are razor sharp and "cut into his wrists."

Breivik earned international notoriety last year when he detonated a bomb outside the centre-left government's headquarters on July 22nd and then went on the rampage at a youth camp on the island of Utøya, killing 77 people, many of them teenagers.

Tord Jordet, one of his lawyers, confirmed the letter's authenticity to AFP. Norway's justice ministry declined to comment.