Simplify the following text for a Grade 10 native English-speaking person.
Original: His best-known works include Steppenwolf , Siddhartha , and The Glass Bead Game ( also known as Magister Ludi ) , each of which explores an individual 's search for authenticity , self-knowledge and spirituality .
Simplified: His best known works include Steppenwolf , Siddhartha , and The Glass Bead Game ( also known as Magister Ludi ) .