Shalit, who was released last summer after five years, recalled passing the time by "Making a ball out of socks or a shirt and throwing it around.
"I'd make up games for myself, sports stuff mostly. I would also write and play Scattergories," he said.
"I would draw a map of Israel, of the Mitzpe," he said, referring to Mitzpe Hila in northern Israel, where he lives. "I did it to remember. To imagine the places."
Shalit added that at times, he would have to hide his writing because his captors were suspicious, thinking he was spying on them.
Speaking of the day of his release, the former captive said that the magnitude of the event was not lost on him.
"I was nervous. There was a lot of pressure. I didn’t know if anything would happen at the last minute, if anyone would try and hit us, if something would go wrong.
"Once I got out of the car and was handed over to the Egyptians, then there was a sense of relief. All of a sudden I saw all these people around, hundreds. After not seeing more than a handful of people for all those years," was a shock, he said.
Asked about the controversial interview with the Egyptian television, before he was returned to Israel, he said: "She didn't hug me or anything, she just shook my hand.
"She was the first woman I saw in five and a half years," he added.
The interview was made as part of a film about Shalit's release.
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