HOW CAN YOU THROW A BALL AS HARD AS YOU CAN TO ONLY HAVE IT COME BACK TO YOU EVEN IF IT DOESNT BOUNCE OFF ANYTHING RI RIDDLES WITH ANSWERS TO SOLVE - PUZZLES & BRAIN TEASERS

Just One!

Because we know all labels are wrong.
So the BW box must be either BB or WW. Selecting one ball from BW will let you know which.
And the other two boxes can then be worked out logically. Did you answer this riddle correctly?
YES  NO  

A snowball Did you answer this riddle correctly?
YES  NO  

The letter 'n'.

Taking 'n' out of 'window' creates 'widow'. Putting 'n' into 'door' creates 'donor'. Did you answer this riddle correctly?
YES  NO  

A ton Did you answer this riddle correctly?
YES  NO  

Mirror Did you answer this riddle correctly?
YES  NO  

She had mittens! Did you answer this riddle correctly?
YES  NO  

C-A-T-B-A-C-K-W-A-R-D-S! Did you answer this riddle correctly?
YES  NO  

An education. Did you answer this riddle correctly?
YES  NO  

Because if they fell forward, they'd fall into the Boat!
Did you answer this riddle correctly?
YES  NO  

Your breath! Did you answer this riddle correctly?
YES  NO  

Samson. He brought the house down. Did you answer this riddle correctly?
YES  NO  

He threw the ball up. Did you answer this riddle correctly?
YES  NO  

A drum with a hole in it. Did you answer this riddle correctly?
YES  NO  

Throw it straight up. Did you answer this riddle correctly?
YES  NO  

Because it was marble cake! Did you answer this riddle correctly?
YES  NO