Oh, right. <Discworld.>

But wouldn't it have to be capitalized because it's sort of the beginning of a sentence?
Here's the revised version: [My mum helped.]
Memento Ludo
“I know many games. Dad taught me chess, checkers, Go.” The girl said, a genuinely cheerful smile fixed on her face. “Let’s play.”
She sat down on her sister’s bed: a nonchalant gesture under any other circumstances.
Her sister did not respond. She did not seem to be able to, but the girl continued talking regardless.
“How about skip rope? If either of us trips, the other wins. Will you play?” It was a simple question, not a challenge.
She turned towards the hooded and cloaked figure in the corner of the room.
“I accept.” death said calmly, and smiled.
It's not the beginning of a sentence.