Blue's Clues Wiki
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Letters are envelopes that the hosts of Blue's Clues get from Mailbox. Such as, Steve, Joe, and Josh in the US / Kevin Duala in the UK / and Duarte from Portugal.

Season 1[]

Episode Picture Description Image Stamps Color Letters Notes
"Blue Prints"
Letter from Blue Prints
Red Brown
"Snack Time"
Letter from Blue's Clues Snack Time
Apple Red
"What Time is it for Blue?"
Letter from Blue's Clues What Time is it for Blue (2)
Tickety Tock Yellow
"Mailbox's Birthday"
Letter from Blue's Clues Mailbox's Birthday
Birthday Present Orange
"Blue's Story Time"
Letter from Blue's Clues Blue's Story Time
Storybook Green
"What Does Blue Need?"
Letter from Blue's Clues What Does Blue Need (2)
Toothbrush Brown
"Blue's Favorite Song"
Letter from Blue's Clues Blue's Favorite Song (2)
Music Note Yellow
"Adventures in Art"
Letter from Blue's Clues Adventures in Art
Paintbrush Brown
"Blue Goes to the Beach"
Letter From Blue's Clues Blue Goes to the Beach (Summer Vacation) (2)
Seahorse Green
"Pretend Time"
Letter from Blue's Clues Pretend Time (2)
Treasure Chest Yellow
"A Snowy Day"
Letter from Blue's Clues A Snowy Day (2)
Snowflake Brown
"The Trying Game"
Letter from Blue's Clues The Trying Game
Bow Lace Brown
"Blue Wants to Play a Game"
Letter from Blue's Clues Blue Wants to Play A Game (2)
Puzzle Piece Yellow
"The Grow Show"
Letter from Blue's Clues The Grow Show (2)
Ruler Brown
"Blue Wants to Play a Song Game"
Letter from Blue's Clues Blue Wants to Play A Song Game (2)
Hand Green
"What Does Blue Want to Make?"
Letter from Blue's Clues What Does Blue Want to Make
Newspaper Hat Brown
"What Story Does Blue Want to Play?"
Letter from Blue's Clues What Story Does Blue Want to Play (2)
Storybook Yellow
"Tickety's Favorite Nursery Rhyme"
Letter from Blue's Clues Tickety's Favorite Nursery Rhyme (2)
Smiley or Happy Face Green
"What Is Blue Afraid Of?"
Letter from Blue's Clues What is Blue Afraid Of (Halloween) (2)
Hand finger Yellow
"Magenta Comes Over"
Letter from Blue's Clues Magenta Comes Over
Friends Green
"Blue's News"
Letter from Blue's Clues Blue's News (2)
Letter from Blue's Clues Blue's News (2) without a picture of Slippery Soap
Storybook with Pencil Brown

Season 2[]

Episode Picture Description Image Stamps Color Letters Notes
"Steve Gets the Sniffles"
Letter from Blue's Clues Steve Gets the Sniffles 2
Stethoscope Green
"What Does Blue Want to Build?"
Letter from Blue's Clues What Does Blue Want to Build (1)
House Yellow
"Blue's Senses"
Letter from Blue's Clues Blue's Senses (2)
Feather Orange
"What Experiment Does Blue Want to Try?"
Letter from Blue's Clues What Experiment Does Blue Want to Try
Magnet Brown
"What Does Blue Want to Make Out of Recycled Things?"
Letter From Blue's Clues What Does Blue Want To Make Out Of Recycled Things (Earth Day Special)
Letter From Blue's Clues What Does Blue Want To Make Out Of Recycled Things (Earth Day Special) without a recycle symbol
Recycle Logo Green
"What Was Blue's Dream About?"
Letter from Blue's Clues What was Blue's Dream About 2
Dream Clouds Brown
"Blue's ABCs"
Letter from Blue's Clues Blue's ABCs (1)
The Word Stamp Yellow
"Math!"
Letter from Blue's Clues Math
Pizza Orange
"Blue's Birthday"
Letter From Blue's Clues Blue's Birthday
Present White
"What Does Blue Want to Do with Her Picture?"
Letter from Blue's Clues What Does Blue Want to do with Her Picture 2
Letter Green
"What Does Blue Want to Do on a Rainy Day?"
Letter From Blue's Clues Music Is An Everyday Way
G-Clef Yellow
"Blue's Surprise at Two O'Clock"
Letter From Blue's Clues Blue's Surprise At Two O'clock
Alarm Clock Brown
"The Lost Episode!"
Letter From Blue's Clues The Lost Episode (1)
Key Chain Orange
"Blue's Sad Day"
Letter From Blue's Clues Blue's Sad Day
Faces Yellow
"What Game Does Blue Want to Learn?"
Letter from Blue's Clues What Game Does Blue Want to Learn
Cards Brown
"What Did Blue See?"
Letter From Blue's Clues What Did Blue See
Human Face Side Silhouette Yellow
"Nurture!"
Letter from Blue's Clues Nurture 2
Heart Red
"Blue Is Frustrated"
Letter from Blue's Clues Blue is Frustrated
Zipper Green
"What Is Blue Trying to Do?"
Letter from Blue's Clues What is Blue Trying to do (2)
Puzzle Piece Green
"Mechanics!"
Letter From Blue's Clues Mechanics
Tape Cassette Orange

Season 3[]

Episode Picture Description Image Stamps Color Letters Notes
"Art Appreciation"
Letter from Blue's Clues Art Apprecation (2)
Paint Palette Orange
"Weight and Balance"
Letter from Blue's Clues Weight and Balance 2
Feather Yellow
"What's That Sound?"
Letter from Blue's Clues What's That Sound 2
Sound Waves Pink
"Animal Behavior!"
Letter from Blue's Clues Animal Behavior
Kitten Face Pink
"Blue's Big Pajama Party"
Letter from Blue's Clues Blue's Big Pajama Party (2)
Day & Night Orange
"Draw Along with Blue"
Letter From Blue's Clues Draw Along With Blue
Pencil (or Number-Two Pencil) Yellow
"Hide and Seek"
Letter from Blue's Clues Hide and Seek
Hiding edge Yellow
"Thankful"
Letter from Blue's Clues Thankful (Thanksgiving Special)
Leaf Yellow
"Blue's Big Holiday"
Letter from Blue's Clues Blue's Big Hoilday
Snowflake Yellow
"Pool Party"
Letter From Blue's Clues Pool Party (Summer Vacation) (2)
Beach Ball Orange
"Anatomy"
Letter from Blue's Clues Anatomy
Bone Yellow
"Signs"
Letter from Blue's Clues Signs
I Love you Sign Green
"Nature"
Letter from Blue's Clues Nature
Ladybug Brown
"Geography"
Letter from Blue's Clues Geography
World Globe Green
"Occupations"
Letter from Blue's Clues Occupations
Mail Truck Orange
"Blue's Big Mystery"
Letter from Blue's Clues Blue's Big Mystery
Question Mark Orange
"Periwinkle Misses His Friend"
Letter From Blue's Clues Periwinkle Misses His Friend
City Orange
"What's So Funny?"
Letter from Blue's Clues What's So Funny
Funny Face Green
"Blue's Big Costume Party"
Letter from Blue's Clues Blue's Big Costume Party (Halloween)
Jack o Lantern Green
"Inventions"
Letter From Blue's Clues Inventions
Light Bulb Yellow
"Blue's Play"
Letter from Blue's Clues Blue's Play
Sock and Buskin Yellow
"Prehistoric Blue"
Letter from Blue's Clues Prehistoric Blue (2)
T-Rex Orange
"The Wrong Shirt"
Letter from Blue's Clues The Wrong Shirt
Friends Yellow
"Words"
Letter from Blue's Clues Words 2
The Word Stamp Yellow
"Shy"
Letter from Blue's Clues Shy
Kid Behind the fence Orange
"Magenta Gets Glasses"
Letter from Blue's Clues Magenta Gets Glasses
Glasses Yellow
"Environments"
Letter from Blue's Clues Environments (2)
Frog Orange
"Stormy Weather'
Letter from Blue's Clues Stormy Weather
Storm Cloud Yellow
"Blue's Collection"
Letter From Blue's Clues Blue's Collection
Stamp Collection Yellow
"Café Blue"
Letter from Blue's Clues Cafe Blue (2)
Fork & Spoon Yellow

Season 4[]

Episode Picture Description Image Stamps Color Letters Notes
"Imagine Nation"
Letter From Blue's Clues Imagine Nation (2)
Button Orange
"Adventure"
Letter From Blue's Clues Adventure (1)
Castle Yellow
"The Anything Box"
Letter From Blue's Clues The Anything Box (1)
Box Yellow
"Superfriends"
Letter From Blue's Clues Superfriends (2)
Superhero Orange
"What's New, Blue?"
Letter from Blue's Clues What's New Blue
Kid reading newspaper Orange
"Blue's New Place"
Letter from Blue's Clues Blue's New Place
Kid hiding and waving. Yellow
"Mr. Salt and Mrs. Pepper Day"
Letter From Blue's Clues Mr. Salt and Mrs
Hand Orange
"The Baby's Here!""
Letter from Blue's Clues The Baby's Here (1)
Baby Face Yellow
"Making Changes"
Letter from Blue's Clues Making Changes
Family Orange
"Bugs!"
Letter From Blue's Clues Bugs 1
Beatle Orange
"¡Un Día Con Plum!"
Carta from Blue's Clues Un Dia Con Plum
World Globe Orange
"What's Inside?"
Letter from Blue's Clues What's Inside (1st)
Letter from Blue's Clues What's Inside (2nd)
Letter from Blue's Clues What's Inside (3rd)
Chick inside the egg, then Chick cracked egg, and last Chick. Green

Orange Yellow

"Blocks"
Letter from Blue's Clues Blocks (2)
Block Tower Orange
"Blue's Backyard Ballgame Bonanza"
Letter from Blue's Clues Blue's Backyard Ballgame Bonanza 2
Ball Green
"Puppets"
Letter from Blue's Clues Puppets 2
Sock and Buskin Yellow
"Rhyme Time"
Letter from Blue's Clues Rhyme Time
Lamp Green
"Let's Plant"
Letter From Blue's Clues Let's Plant (Earth Day Special)
Sunflower Green
"Blue's Book Nook"
Letter from Blue's Clues Blue's Book Nook (2)
Reading Book Orange
"Let's Boogie"
Letter from Blue's Clues Let's Boogie (2)
Dancing Orange
"Blue's School"
Letter from Blue's Clues Blue's School (Back to school on September 1st) (1)
School Bus Orange
"Something To Do Blue"
Letter from Blue's Clues Something to do Blue (2)
Face chartreuse background Yellow
"Joe's First Day" Teddy Bear Yellow
"Joe Gets a Clue" Thinking Chair Yellow
"Steve Goes to College" Brown kid waving Yellow

Season 5[]

Episode Picture Description Image Stamps Color Letters Notes
"Can You Help?" Smile Face Orange
"Colors Everywhere!" Paintbrush Yellow
"The Snack Chart" Chart Orange
"The Big Book About Us" Open Book Orange
"Playing Store" Shopping Brown bag Green
"Patience" Alarm Clock Yellow
"Joe's Surprise Party" Cupcake Orange
"I'm So Happy!" Smile Face Orange
"The Boat Float" Sailboat Yellow
"Bedtime Business" Bed Orange
"Shape Searchers" Green Square Yellow
"Blue Goes to the Doctor" Plus Sign Orange
"Contraptions!" Gadgets Green
"A Brand New Game" Spinner Orange
"A Surprise Guest" Question Mark Orange
"Dress Up Day" Mask Orange
"Blue's Big Band" Drum Green
"Up, Down, All Around!" Arrow left & rights Yellow
"Story Wall" Storybook Yellow
"The Alphabet Train" ABC Blocks Green
"Numbers Everywhere!" Number 35 Orange
"Blue's Predictions" Spinner Orange
"Our Neighborhood Festival" Pennant banner flags Yellow
"Meet Polka Dots!" Kid Face Yellow
"The Scavenger Hunt" Check Mark Orange
"Let's Write!" Pencil (or Number-Two Pencil) Orange
"Body Language Body Long Orange
"Blue's Big Car Trip" Car Yellow
"Look Carefully..." Eyes Orange
"I Did That!" Body top of the Mountain Yellow
"Animals in Our House?" Rubber Duck Orange
"Morning Music" Sun Yellow
"Blue's First Holiday" World Globe Yellow

Season 6[]

Episode Picture Description Image Stamps Color Letters Notes
"Love Day" 3 hearts Orange
"Blue's Wishes" Wand Orange
"Joe's Clues" Green Squares Yellow
"Playdates" People Orange
"Soccer Practice" Soccer Ball Orange
"Bluestock" G-Clef Orange

Season 1 UK[]

Episode Picture Description Image Stamps Color Letters Notes
"What Game Does Blue Want to Play? (UK)"
Letter from Blue's Clues (1x01) Blue Wants to Play a Game (UK)
Puzzle Piece Yellow
"What Story Does Blue Want to Play? (UK)"
Letter from Blue's Clues (1x02) What Story Does Blue Want to Play (UK)
Storybook Yellow
"What Is Blue Afraid Of? (UK)"
Letter from Blue's Clues (1x03) What is Blue Afraid Of (Halloween) (UK)
Hand Finger Yellow
"Pretend Time (UK)"
Letter from Blue's Clues (1x04) Pretend Time (UK)
Toy Chest Yellow
"The Grow Show (UK)"
Letter from Blue's Clues (1x05) The Grow Show (UK)
Ruler Red
"Blue's News (UK)"
Letter from Blue's Clues (1x06) Blue's News (UK)
Storybook with Pencil Brown
"Magenta Comes Over (UK)"
Letter from Blue's Clues (1x07) Magenta Comes Over (UK)
Friends Green
"What Does Blue Want to Make? (UK)"
Letter from Blue's Clues (1x08) What Does Blue Want Make (UK)
Newspaper Hat Orange
"Tickety's Favorite Nursery Rhyme (UK)"
Letter from Blue's Clues (1x09) Tickety's Favourite Nursery Rhyme (UK)
Smile Face Green
"The Trying Game (UK)"
Letter from Blue's Clues (1x10) The Trying Game (UK)
Shoe Lace Brown

Season 2 UK[]

Episode Picture Description Image Stamps Color Letters Notes
"What Song Game Does Blue Want to Play? (UK)"
Letter from Blue's Clues (2x01) Blue Wants to Play a Song Game (UK)
Hand Green
"Kevin Gets the Sniffles (UK)"
Letter from Blue's Clues (2x02) Kevin Gets the Sniffles (UK)
Stethoscope Green
"What Does Blue Want to Build? (UK)"
Letter from Blue's Clues (2x03) What Does Blue Want to Build (UK)
House Yellow
"What Does Blue Want to Play Now? (UK)"
Letter from Blue's Clues (2x04) Blue's Senses (UK)
Feather Orange
"Blue Experiments (UK)"
Letter from Blue's Clues (2x05) What Experiment Does Blue Want to Try (UK)
Magnet Orange
"Blue Recycles (UK)"
Letter from Blue's Clues (2x06) What Does Blue Want To Make Out Of Recycled Things (Earth Day Special) (UK)
Recycle Logo Green
"What Was Blue's Dream About? (UK)"
Letter from Blue's Clues (2x07) What Was Blue's Dream About (UK)
Dream Clouds Orange
"Math! (UK)"
Letter from Blue's Clues (2x08) Maths (UK)
Pizza Orange
"Blue's Birthday (UK)"
Letter from Blue's Clues (2x09) Blue's Birthday (UK)
Present White
"What Does Blue Want to Do with our Drawing? (UK)"
Letter from Blue's Clues (2x10) What Does Blue Want to do with Her Picture (UK)
Letter Green


Season 3 UK[]

Episode Picture Description Image Stamps Color Letters Notes
"Music is an Every Day Way (UK)"
Letter from Blue's Clues (3x01) Music is an Every Day Way (UK)
G-Clef Green
"Where Did Blue lose your Backpack (UK)"
Letter from Blue's Clues (3x02) The Lost Episode (UK)
Key Chains Yellow
"Blue's Sad Day (UK)"
Letter From Blue's Clues (3x03) Blue's Sad Day
Faces Orange
"What Do We Need To Do Today? (UK)"
Letter from Blue's Clues (3x04) Nurture (UK)
Heart Green
"Frustration (UK)"
Letter From Blue's Clues (3x05) Blue is Frustrated (UK)
Zipper Yellow
"Art Appreciation (UK)"
Letter from Blue's Clues (3x06) Art Apprecation (UK)
Palette Yellow
"Blue's Surprise at Two O'Clock (UK)"
Letter from Blue's Clues UK Blue's Surprise at Two O Clock
Alarm Clock Orange
"What's That Sound? (UK)"
Letter from Blue's Clues (3x08) What's That Sound (UK)
Sound Waves Green
"Mechanics! (UK)"
Letter from Blue's Clues UK Mechanics
Tape Cassette Green
"Animal Behaviour (UK)"
Letter from Blue's Clues (3x10) Animal Behaviour (UK)
Kitten Face Yellow

Season 4 UK[]

Episode Picture Description Image Stamps Color Letters Notes
"Geography (UK)"
Letter from Blue's Clues (4x01) Geography (UK)
World Globe Green
"Hide and Seek (UK)"
Letter from Blue's Clues (4x02) Hide and Seek (UK)
Hiding Edge Orange
"Occupations (UK)"
Letter from Blue's Clues (4x03) Occupations (UK)
Mail Truck Yellow
"Anatomy (UK)"
Letter from Blue's Clues (4x04) Anatomy (UK)
Bone Green
"Pool Party (UK)"
Letter from Blue's Clues (4x05) Pool Party (Summer Vacation) (UK)
Beach Ball Green
"Draw Along with Blue (UK)"
Letter From Blue's Clues (4x06) Draw Along with Blue (UK)
Pencil Orange
"Nature (UK)"
Letter From Blue's Clues (4x07) Nature (UK)
Ladybug Brown
"Inventions (UK)"
Letter from Blue's Clues (4x08) Inventions (UK)
Light Bulb Green
"What's So Funny? (UK)"
Letter From Blue's Clues (4x09) What's So Funny (UK)
Silly Face Green
"Blue's Big Costume Party (UK)"
Letter from Blue's Clues (4x10) Blue's Big Costume Party (UK)
Jack O Lantern Orange
"Blue's Big Pyjama Party (UK)"
Letter from Blue's Clues Blue's Big Pyjama Party (UK)
Day and Night Yellow
"Blue's Big Mystery (UK)"
Letter from Blue's Clues (4x12) Blue's Big Mystery (UK)
Question Mark Yellow
"Blue's Play (UK)"
Letter from Blue's Clues (4x13) Blue's Play (UK)
Sock and Bruskin Yellow
"Prehistoric Blue (UK)"
Letter from Blue's Clues (4x14) Prehistoric Blue (UK)
Dinosaur Orange
"Periwinkle Misses His Friend (UK)"
Letter from Blue's Clues (4x15) Periwinkle Misses His Friend (UK)
City Yellow

Season 5 UK[]

Episode Picture Description Image Stamps Color Letters Notes
"Environments (UK)"
Letter from Blue's Clues (5x01) Environments (UK)
Frog Green
"Blue's Collection (UK)"
Letter from Blue's Clues (5x02) Blue's Collection (UK)
Button Orange
"The Wrong Shirt (UK)"
Letter from Blue's Clues (5x03) The Wrong Shirt (UK)
Friends Yellow
"Café Blue (UK)"
Letter from Blue's Clues (5x04) Cafe Blue (UK)
Fork and Spoon Green
"Imagine Nation (UK)"
Letter from Blue's Clues (5x05) Imagine Nation (UK)
Button Orange
"Adventure (UK)"
Letter from Blue's Clues (5x06) Adventure (UK)
Castle Orange
"Superfriends (UK)"
Letter from Blue's Clues (5x07) Superfriends (UK)
Superhero Green
"Bugs! (UK)"
Letter from Blue's Clues (5x08) Bugs (UK)
Beatle Yellow
"¡Un Día Con Plum! (UK)"
Letter from Blue's Clues (5x09) Un Dia Con Plum (Cinco de Mayo) (UK)
Globe Green
"What's New, Blue? (UK)"
Letter from Blue's Clues (5x10) What's New Blue (UK)
Kid Reading Newspaper Yellow
"Special Spaces (UK)"
Letter from Blue's Clues (5x11) Special Spaces (UK)
Kid hiding edge. Yellow
"Mrs. Pepper and Mr. Salt Day (UK)"
Letter from Blue's Clues (5x12) Mrs. Pepper and Mr
Hand Yellow
"The Baby's Here! (UK)"
Letter from Blue's Clues (5x13) The Baby's Here (UK)
Baby Face Yellow
"Making Changes (UK)"
Letter from Blue's Clues (5x14) Making Changes (UK)
Family Green
"What's Inside? (UK)"
Letter from Blue's Clues (5x15) What's Inside (1st) (UK)
Letter from Blue's Clues (5x15) What's Inside (2nd) (UK)
Letter from Blue's Clues (5x15) What's Inside (3rd) (UK)
Chick inside the egg, then Chick cracked egg, and last Chick. Orange

Yellow Green

Season 6 UK[]

Episode Picture Description Image Stamps Color Letters Notes
"Something To Do Blue (UK)"
Letter From Blue's Clues UK Something to do Blue
Kid Yellow
"Let's Boogie (UK)" Dancing Red
"Blocks (UK)" Block Tower Yellow
"Blue's Backyard Ballgame (UK)" Ball Orange
"Let's Plant (UK)" Sunflower Yellow
"Puppets" Sock and Bruskin Orange
"I'm So Happy! (UK)" Happy Face Orange
"Shape Searchers (UK)" Green Square Yellow
"The Big Book About Us (UK)" Book Yellow
"Can You Help? (UK)" Happy Face Orange
"Colours (UK)" Paint Brush Yellow
"Rhythm and Blue (UK)" Drum Yellow
"Blue's Charts (UK)" Charts Yellow
"Playing Store (UK)" Shopping Bag Yellow
"Patience (UK)" Alarm Clock Yellow

PC Games[]

Episode Picture Description Image Stamps Color Letters Notes
"Blue's ABC Time Activities"
Letter from Blue's Clues Blue's ABC Time Activities (1)
Letter from Blue's Clues Blue's ABC Time Activities (2)
Letter from Blue's Clues Blue's ABC Time Activities (3)
Letter from Blue's Clues Blue's ABC Time Activities (4)
Letter from Blue's Clues Blue's ABC Time Activities (5)
Square/Book/Smile/Paintbrush/Hearts Purple/Pink/Yellow/Red/Orange
"Blue's Treasure Hunt: A Learning Adventure"
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 2
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 3
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 4
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 5
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 6
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 7
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 8
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 9
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 10
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 11
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 12
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 13
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 14
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 15
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 16
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 17
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 18
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 19
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 20
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 21
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 22
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 23
Letter from Blue's Clues Blue's Treasure Hunt A learning Adventure 24
Magenta/Blue/Mr. Salt/Pail/Tickety/Mrs. Pepper/Shovel/Slippery Yellow
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