"The test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function."
~ F. Scott Fitzgerald
"The modern master of the gamebook format" (Rob Sanders)... "Can do dark very well" (Jonathan Oliver)... "Green gets mileage out of his monsters" (SFX Magazine)... "It takes a firm editorial hand and a keen understanding of the tone of each piece to make a collection this diverse work, and Green makes it look effortless" (Starburst Magazine)... "A charming blend of camp creatures, humour, and genuine horror" (Set the Tape)
That's right π , as in Pi the mathematical constant.
However, since that particular book is out of print, I'm going to go with Alice's Nightmare in Wonderland instead, because Alice's creator, Lewis Carroll, was really Charles Lutwidge Dodgson, a mathematics don at Oxford University. My gamebook even features a few mathematical teasers.