- The Big Apple Mystery/The Missing Pickle Car Mystery
- The Mystery Wheel/Busytown Blue-Bottoms
- The Mystery of the Lost Parrot/The Monster Mystery
- The Trouble With Bubbles/Little Orphan Egg
- The Lighthouse Ghost Mystery/Cornfield Confusion
- The Sticky Stuff Mystery/Up, Up and Away
- Six Little Muffins/The Crashing Cans Mystery
- The Invisible Cake Snatcher/On the Move
- Litterbug Busters/There Might Be Giants
- Where's Junior?/The Secret Club Mystery
- The Playground Mystery/The Crazy Clock Mix-Up Mystery
- The Cheese Car Chomp Mystery/Where's the Hero?
- The Mystery of the Unbreakable Bread/The Twisty Line Mystery
- Chain of Mysteries/The Mystery of the Unfinished Painting
- The Pretty Park Mystery/The Missing Museum Statue Mystery
- The Vanishing Tiara Mystery/The Postage Stamp Mystery
- The Bank Note Mystery/The Flying Saucer Mystery
- The Mystery Present/The Smudged Letter Mystery
- The Falling Fruit Mystery/The Dragon Hunters
- The Disappearing Swimming Hole/The Forgotten Fire Hose Mystery
- The Disappearing Home Mystery/The Slipping, Sliding, Flipping, Flying Mystery
- The Mystery of the Unpopular Pizzeria/The Silly Scarecrow Mystery
- Huckle! Where's My Apple Car?/The Dirty Laundry Mystery
- The Eight Shoes Mystery/The Something in the Woods Mystery
- The Borrowed Book Mystery/The Missing Mystery Books
- The Mystery of the High Jumper/The Mystery of the Summer Snowman
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