So... Second riddle for me. Somehow more difficult than the last one.
Pick a side, then relax
it may take a hour or two.
If you throw it, then it cracks,
but it puzzles, why would you?It is one, yet has many;
with it figure what to do!
if you possibly own any,
that it's old you always knew.Three Six Nine are the numbers
that describe me as a clue.
Ninety also, for the slumbers
which won't even read anew.
What is it?