ARTHUR Season 10 Scavenger Hunt

As an Easter egg for season 10, every episode included the number '10' hidden in various locations. All Season 10 episodes have a marked circular 10 icon on the episode title card.

While the season was airing, viewers could go to the PBS Arthur website to participate in a related contest: "Arthur's Crazy 10's Scavenger Hunt". (archived page) Kids who successfully located at least ten 10s, as indicated on the downloadable tally form, could submit a completed form to producing station WGBH to be entered in a prize drawing. Three winners received a home phone answering machine message recorded by Buster (Daniel Brochu). Although the contest entry form refers to thirty-seven possible hidden 10s, there are many more visual instances and other references to the number 10 throughout the season, as listed below.

Happy Anniversary

 * Jane and David Read are celebrating their tenth anniversary.
 * The name of the Ten Spot Diner.
 * The jukebox costs a dime (10 cents) to operate.
 * The Bionic Bunny show is airing a 10th anniversary special where Bionic Bunny meets Dark Bunny.
 * Arthur says he is going to dress up as a character from episode 410.
 * The Reads' get stranded on Country Route 10.
 * The Tibbles mistake the word "tin" for "ten."
 * In the middle, Buster reads 10 top reasons why Arthur (the TV show) is good to watch.
 * When the story begins from the radio one of the signs says ten oaks.
 * On the toy sailboat in the Tibbles' pool, which relates to a tugboat Ten Cents from Tugs.
 * The Tibbles want 10 dollars for the toy soldier.
 * Arthur imagines himself being shrunken 10 times.
 * On the Sandwich Mobile flag in Arthur's dream.
 * David says that they have everything packed and that they have 10 minutes to spare.
 * The Sampo pineapples have a 100%  percent sign on the can.
 * On the radio while listening to the Western story, the antagonists say that if they are seen, it will cost them 10%.
 * The name Jay starts with and sounds like the letter J. J is the 10th letter of the alphabet.
 * In the opening, the class is watching a video where the camera zooms out each time by 10.

The Squirrels

 * One of the kid videos is "Silly Squirrels Count to 10".

Fern & Persimmony Glitchet

 * On top of Fern's door when she looks in the mailbox.
 * When Fern asks Ms. Turner how many long more it will take until the next book comes out, the answer is ten weeks.
 * On the helicopter which Max Wheeler jumps out of, there is the code 'N10B'.

Desert Island Dish

 * Arthur would bring 10 hard boiled eggs on a desert island.
 * On the June calendar.

The Secret About Secrets

 * D.W. complains to Nadine that Arthur kept his tenth secret from her.
 * While playing hopscotch, D.W. and Emily jump on the number 10.
 * When Grandma Thora was 10, she found a way to keep secrets.

Feeling Flush

 * Francine reads the apartment room water meter: B-10.
 * There's a 10 on one of the wooden doors in the apartment basement.
 * The apartment building would have to replace 110 toilets.
 * The Reads used 10,500 liters of water.
 * Francine only has 10 days left of carrying Arthur's backpack.
 * Mr. Sanders would save over 25 million liters of water in 10 years.

Family Fortune

 * The man who owns the $30,000 chair bought it for $10.

D.W. Aims High

 * D.W. can count to 10.
 * D.W. told Nadine to set the gigatron to 10.
 * On the spacecraft.
 * There's a 10 on D.W.'s and Nadine's spacesuit when they imagine themselves landing on Mars.

Flaw and Order

 * They were at Arthur's house at both 4:10 and 6:10 PM.
 * A 10 is on the man hole cover.

The Curse of the Grebes

 * On one of the Grebes banners in the treehouse.
 * On one of Brain's papers.
 * A "Section 10" sign on the wall when Mucky Flint bats.
 * There's a 10 printed on one fan's shirt at the final game.
 * There's a 10 on the scoreboard at the last game.

Arthur Changes Gears

 * On the ghost's shirt.
 * The GX Trailblazer 10,000.

Unfinished

 * On the blimp.
 * On the floor where the blimp took off.
 * On the light lamp on the way to the place where the blimp took off.
 * "93 Million Miles in a Balloon" was checked out 10 years ago.
 * On the Internet, 93,000 Miles in a Balloon costs $1000.

D.W., Bossy Boots

 * On the Boss-O-Meter, D.W. scores around the 10 mark.
 * The Marie Antoinnette doll comes with 10 dresses.
 * A 10% sign hangs up inside the toy store at the beginning.

Binky vs. Binky

 * Binky writes that he is 10 years old on the sign-up sheet.
 * Binky wears a vest that has a 10 on it.
 * Binky's soccer jersey also has a 10.
 * Binky's baseball uniform also has a 10.
 * At the pizza restaurant, there is a "2 for 10$" poster on the wall.
 * On a Racing Day billboard.

Operation D.W.

 * On a billboard during the prologue.
 * On Buster's transforming car/boat.
 * On the Brave-O-Meter.
 * Dr. Tinnitus sounds like "Dr. Ten-nitus.
 * On the soda machine.
 * In D.W.'s dream before the operation, the exam room says 10.

Do You Speak George?

 * At the very end of the episode a streak in the dirt is the 1 and the marble arena is a 0.
 * On George's house next to his front door.
 * The Brain says "10" in his language.

World Girls

 * A 10% poster on the wall when Sue Ellen gets in the line.
 * Another 10% poster on the wall in one of the World Girl World exhibits.
 * An Olympics World Girl doll scored a perfect 10.
 * Bailey says they have 10 countries left to visit.
 * On one of the doll assembly machines.

What's Cooking?

 * Ming Tsai cooked the butterfly shrimp in 10 seconds.
 * Arthur sets his alarm clock to 6:10 AM.
 * Sue Ellen tells Ming that if he references to card 10, he'll see what the spoons were used by.

Buster's Special Delivery

 * The mailman's hat had the number 10 on it when Buster speaks to him.
 * The student mail carrier gets to skip 10 minutes of homeroom.
 * Muffy says she is subscribed to 10 magazines.
 * The gym coach tells the students to run 10 laps.