We've got your back. With the Tough-O-Meter, you'll know whether to bring extra layers or Swiss army knives as you summit the literary mountain. (10 = Toughest)
(2) Sea Level
Good news: The Westing Game is way less of a brain strain than the average game of chess.
The Westing Game isn't that tough to read, at least on the surface. Sure, there's a great mystery throughout the book, but you can just read along with the characters and figure out the clues along with them.
None of the words used are that big—at least, not really—and the ones that seem kind of unusual, like "dastardly," get defined in the book for us. Lucky for us, in order to solve the mystery, the characters have to rely on their considerable smarts.
Pro-tip: reading The Westing Game the second time over is super-satisfying—it allows you to see how the clues got folded into the plot.