Lair of the Sphinx is a collection of 77 original riddles from the game designers at Cloud Kingdom Games. Here are a couple of sample riddles to try:

Riddle #1:

Always smiles or maybe frowns
Sinks in water, never drowns.
Catches prey on its barbed teeth
Hunts all day, but never eats.

Riddle #2:

A dozen Royals gathered round,
Entertained by two who clowned.
Each King there had servants ten,
Though none of them were also men.
The lowest servant sometimes might,
Defeat the King in a fair fight.
A...