Guess Who? Puzzles are 30-second puzzle sequences made up of screenshots of various characters from Series 13 through The Great Race. The images are divided on a 12-piece template and follow a sequence of assembly as an instrumental clip of Thomas, You're the Leader plays in the background. Usually, the featured character's whistle, horn, bell or siren sound plays at the end.
From 2010 to early 2013, the puzzles were narrated by Ben Small for UK audiences and Michael Brandon for US audiences. From fall 2013 to 2016, the puzzles were narrated by Mark Moraghan. The puzzles were often included as bonus features on various UK, Australian, US, Canadian, Mexican and Latin American DVD releases and also shown near the end of the US PBS half-hour airings from Series 13 to 20.
Puzzles
Ben Small/Michael Brandon/Mark Moraghan
- Thomas (Blue background: Ben Small: Curious Cargo UK DVD, Michael Brandon: A Very Thomas Christmas US/CAN DVD, Trouble on the Tracks US/CAN DVD, Mark Moraghan: Start Your Engines! US/CAN DVD, Yellow background: Michael Brandon: All Together Now original PBS airing, Season 16 (Digital Download), Mark Moraghan: Santa's Little Engine US/CAN DVD)
- Edward (Ben Small: Rescue on the Rails UK DVD, Michael Brandon: Marvelous Moments! original PBS airing, Sticky Situations US/CAN DVD)
- Henry (Ben Small: Merry Winter Wish UK DVD, Michael Brandon: Good Deeds original PBS airing and Schoolhouse Delivery US/CAN DVD, Mark Moraghan: Taking Turns PBS airing)
- Gordon (Ben Small: Muddy Matters UK DVD, Michael Brandon: Friends and Family original PBS airing, Up, Up and Away! US/CAN DVD, Mark Moraghan: Railway Mischief, Start Your Engines! and Tinsel on the Tracks US/CAN DVDs)
- Sir Topham Hatt (Michael Brandon: Signals Crossed US/CAN DVD, Mark Moraghan: Santa's Little Engine US/CAN DVD) / The Fat Controller (Ben Small: Big Bang Surprise UK DVD)
- James (Ben Small: Rescue on the Rails UK DVD, Michael Brandon: Working Well and Fun on the Farm original PBS airings, Season 16 (Digital Download), Trouble on the Tracks US/CAN DVD, Mark Morghan: Spooky Charms PBS airing, Spills and Thrills, Engines to the Rescue and Start Your Engines! US/CAN DVDs)
- Thomas and James (Ben Small: Go Go Thomas! UK DVD, Michael Brandon: Muddy Matters US/CAN DVD)
- Percy (Ben Small: The Birthday Express UK DVD, Michael Brandon: A Friend in Need original PBS airing, Season 16 (Digital Download), The Christmas Engines US/CAN DVD, Mark Moraghan: Christmas Cheer PBS airing)
- Thomas and Percy (Ben Small: Big Bang Surprise UK DVD, Michael Brandon: Up, Up and Away! US/CAN DVD, Signals Crossed US/CAN DVD, Just Being You original PBS airing, Season 16 (Digital Download))
- Toby (Ben Small: Curious Cargo UK DVD, Michael Brandon: Trouble on the Tracks US/CAN DVD)
- Mavis (Ben Small: Thomas in Charge! UK DVD, Michael Brandon: Chuffing with Pride original PBS airing, Season 16 (Digital Download), Tricks and Tales PBS airing, Trouble on the Tracks US/CAN DVD)
- Skarloey (Michael Brandon: Don't Give Up original PBS airing, Season 16 (Digital Download), Mark Moraghan: Signals Crossed US/CAN DVD, Coming Home for Christmas PBS airing)
- Rheneas (Ben Small: Merry Christmas, Thomas! UK DVD, Michael Brandon: Let It Snow original PBS airing, Season 16 (Digital Download))
- Sir Handel (Michael Brandon: Muddy Matters US/CAN DVD)
- Peter Sam (Ben Small: Muddy Matters UK DVD, Michael Brandon: Muddy Matters US/CAN DVD, Communication original PBS airing, Season 16 (Digital Download))
- Cranky (Ben Small: Creaky Cranky UK DVD, Michael Brandon: Best Times! and If a Job's Worth Doing original PBS airings, Season 16 (Digital Download))
- Emily (Ben Small: Pop Goes Thomas UK DVD, Michael Brandon: A Very Thomas Christmas US/CAN DVD, Winter Surprise original PBS airing, Season 16 (Digital Download))
- Spencer (Ben Small: Sticky Situations UK DVD, Michael Brandon: Sticky Situations US/CAN DVD, Just Being You original PBS airing, Season 16 (Digital Download))
- Rocky (Ben Small: Full Steam to the Rescue! UK DVD, Mark Moraghan: Santa's Little Engines US/CAN DVD, Tinsel and Trains PBS airing)
- Thomas and Rocky (Michael Brandon: Schoolhouse Delivery US/CAN DVD, Mark Moraghan: Tales from the Rails UK DVD, Tinsel on the Tracks US/CAN DVD)
- Rosie (Ben Small: Full Steam to the Rescue! UK DVD)
- Victor (Ben Small: Wobbly Wheels and Whistles UK DVD, Michael Brandon: Sticky Situations US/CAN DVD)
- Kevin (Ben Small: Up, Up and Away! UK DVD, Michael Brandon: Helpful Friends PBS airing, Mark Moraghan: Railway Mischief US/CAN DVD, Tricks and Tales PBS airing)
- Hiro (Ben Small: The Lion of Sodor UK DVD, Michael Brandon: Schoolhouse Delivery US/CAN DVD, Mark Moraghan: Spooky Charms PBS airing)
- Charlie (Ben Small: Sticky Situations UK DVD, Michael Brandon: A Very Thomas Christmas US/CAN DVD, Let It Snow original PBS airing, Season 16 (Digital Download))
- Dash (Ben Small: Up, Up and Away! UK DVD, Michael Brandon: Up, Up and Away! US/CAN DVD, Mark Moraghan: Fire and Water, Going Underground and Passengers PBS airings)
- Scruff (Michael Brandon: If a Job's Worth Doing original PBS airing, Season 16 (Digital Download), Mark Moraghan: Railway Mischief and Start Your Engines! US/CAN DVDs)
- Belle (Ben Small: Day of the Diesels UK/AUS DVD/Blu-ray, Mark Moraghan: Engines to the Rescue US DVD, Look and Listen, Taking Turns and Tinsel and Trains PBS airings)
- Flynn (Ben Small: Day of the Diesels UK/AUS DVD/Blu-ray, Michael Brandon: Go Go Thomas! US/CAN DVD, Chuffing with Pride original PBS airing, Season 16 (Digital Download), Mark Moraghan: Engines to the Rescue US DVD, Sea and Sand and Going Underground PBS airings)
- Den and Dart (Ben Small: Merry Christmas, Thomas! UK DVD, Michael Brandon: Go Go Thomas! US/CAN DVD, All Together Now original PBS airing, Fun on the Farm original PBS airing, Season 16 (Digital Download))
- Paxton (Ben Small: Blue Mountain Mystery UK/AUS DVD, Mark Moraghan: The Thomas Way US/CAN DVD, Sea and Sand PBS airing)
- Merrick (Ben Small: Blue Mountain Mystery UK/AUS DVD, Mark Moraghan: Snow Stops Play PBS airing)
- Owen (Ben Small: Blue Mountain Mystery UK/AUS DVD)
- Winston (Michael Brandon: Don't Give Up original PBS airing, Season 16 (Digital Download), Mark Moraghan: Tales from the Rails UK DVD, Tinsel on the Tracks US/CAN DVD)
- Luke (Ben Small: Blue Mountain Mystery UK/AUS DVD, Mark Moraghan: The Thomas Way US/CAN DVD, Passengers PBS airing)
- Stafford (Ben Small: Go Go Thomas! UK DVD, Michael Brandon: Go Go Thomas! US/CAN DVD, Communication original PBS airing, Season 16 (Digital Download))
Mark Moraghan only
- Duck (The Thomas Way US/CAN DVD, Recycle Recycle Recycle! PBS airing)
- Donald and Douglas (Sodor's Legend of the Lost Treasure UK/US/CAN/AUS DVD/Blu-ray)
- Bill and Ben (Engines to the Rescue US DVD, Fast and Reliable, Please Be Patient! and Slowly Wins the Race PBS airings)
- The Flying Scotsman (The Great Race UK/US/CAN/AUS DVD/Blu-ray)
- Oliver (Whale of a Tale US/CAN DVD, Thomas' Christmas Carol UK/AUS DVD, 'Tis the Season to Be Jolly and The Race Is On PBS airings)
- Toad (Whale of a Tale US/CAN DVD, Thomas' Christmas Carol UK/AUS DVD, There's Always a Good Explanation, Illuminating Minds, Spooky Snow and Slowly Wins the Race PBS airings)
- Rusty (Tinsel on the Tracks US/CAN DVD)
- Duncan (The Christmas Engines US/CAN DVD, Signals and Alarms PBS airing)
- Harvey (Spills and Thrills US/CAN DVD, Fast and Reliable, Signals and Alarms and Patience and Rules PBS airings)
- Jack (There's Always a Good Explanation, Special Friends and Be Good to Your Friends PBS airings)
- Millie (King of the Railway UK/US/CAN/AUS DVD/Blu-ray)
- Stephen (King of the Railway UK/US/CAN/AUS DVD/Blu-ray, The Great Race PBS airing)
- Connor (King of the Railway UK/US/CAN/AUS DVD/Blu-ray, The Christmas Engines US/CAN DVD, Fire and Water and Coming Home for Christmas PBS airings)
- Caitlin (King of the Railway UK/US/CAN/AUS DVD/Blu-ray, Look and Listen PBS airing)
- Porter (Spills and Thrills US/CAN DVD, Illuminating Minds and Recycle Recycle Recycle! PBS airings)
- Timothy (Tale of the Brave UK/US/CAN/AUS DVD/Blu-ray, All At Sea and Be Good to Your Friends PBS airing)
- Marion (Tale of the Brave UK/US/CAN/AUS DVD/Blu-ray, Dinos and Discoveries US/CAN DVD, Special Friends and The Great Race PBS airings)
- Gator (Tale of the Brave UK/US/CAN/AUS DVD/Blu-ray, Competing Engines PBS airing)
- Reg (Tale of the Brave UK/US/CAN/AUS DVD/Blu-ray, The Race Is On, Patience and Rules and A Time for Sharing PBS airings)
- Samson (Tales from the Rails UK DVD, Dinos and Discoveries and Wild Water Rescue US/CAN DVDs, Please Be Patient!, All At Sea and Competing Engines PBS airings)
- Rex, Mike and Bert (Sodor's Legend of the Lost Treasure UK/US/CAN/AUS DVD/Blu-ray)
- Ryan (Sodor's Legend of the Lost Treasure UK/US/CAN/AUS DVD/Blu-ray)
- Skiff (Sodor's Legend of the Lost Treasure UK/US/CAN/AUS DVD/Blu-ray)
- Philip (The Great Race UK/US/CAN/AUS DVD/Blu-ray)
- Ashima (The Great Race UK/AUS DVD)
- Etienne (The Great Race UK/US/CAN/AUS DVD/Blu-ray)
- Rajiv (The Great Race UK/US/CAN/AUS DVD/Blu-ray)
- Shane (The Great Race UK/US/CAN/AUS DVD/Blu-ray)
- Vinnie (The Great Race UK/US/CAN/AUS DVD/Blu-ray)
- Yong Bao (The Great Race UK/AUS DVD)
Trivia
- There are two Guess Who? Puzzles for Thomas, one with a blue background and a screenshot from Thomas and the Pigs and another with a yellow background and a screenshot from Creaky Cranky.
- All the Guess Who? Puzzles were released on DVD except Jack's, which was exclusively shown on PBS.
- Some Mexican and Latin American DVDs feature Guess Who? Puzzles but they are presented in English.
Goofs
- Ben Small and Michael Brandon's versions of James' Guess Who? Puzzle use Gordon's whistle. This was later corrected for Mark Moraghan's version.