Memories from his detention at Jixi re-education-through-labour camp in Heilongjiang province from 2004 still haunt Liu. As well as backbreaking mining toil, he carved chopsticks and toothpicks out of planks of wood until his hands were raw and assembled car seat covers that the prison exported to South Korea and Japan. He was also made to memorise communist literature to pay off his debt to society.
But it was the forced online gaming that was the most surreal part of his imprisonment. The hard slog may have been virtual, but the punishment for falling behind was real.
"If I couldn't complete my work quota, they would punish me physically. They would make me stand with my hands raised in the air and after I returned to my dormitory they would beat me with plastic pipes. We kept playing until we could barely see things," he said.
