A killer moaned about winning too many sweets during a family fun day at the jail dubbed Monster Mansion.
Graham Coutts also boasted of tucking into a Toblerone for the first time since he was jailed 16 years ago.
The murderer was among the prize winners at maximum security HMP Wakefield where 15 cons were treated to a buffet, bingo and quizzes alongside relatives.
He revealed the fun on his online blog, which he gets pals on the outside to write.
The killer said: “There are always some little events they put on – quizzes, bingo, guess the number of sweets in a container, and a raffle.”
Coutts complained a four-way tie “robbed” his team of first place in a music quiz but they ended up winning sweets including a bar of Toblerone.
He added: “We came second in the general knowledge quiz and got another box of sweets. I ended up sharing them with the other tables – too many sweets and too much food from the buffet... groan.”
Coutts is serving life for strangling teacher Jane Longhurst, 31, in Brighton in 2003.
The extreme porn addict kept her body in his shed for weeks as a sick trophy.
Coutts was joined at the prison bash by his mum who went on a 13-hour round trip from Scotland to the West Yorkshire prison.
The Fife-born ex-salesman – who claims to be wrongfully convicted – is due to be transferred to a Scottish jail.
Wakefield has housed some of the most notorious rapists, murderers and serial killers.
They have included Soham monster Ian Huntley and Dr Death Harold Shipman, who murdered more than 200 patients and hanged himself in his cell there in 2004.
