112 books • 10 series
Kart Racing (The Xtreme World of Billy Kool S., #7)
Mountain Biking (The Xtreme World of Billy Kool S., #6)
Skydiving (Xtreme World of Billy Kool, #5)
Golf Legends (Boy's Rule! S.)
Rock Star (Boy's Rule! S.)
Basketball Buddies (Boy's Rule! S.)
Gone Fishing (Boy's Rule! S.)
Wet World (Boy's Rule! S.)
Camping Out (Boy's Rule! S.)
Secret Agent Heroes (Boy's Rule! S.)
Water Rats (Boy's Rule! S.)
Skateboard Dudes (Boy's Rule! S.)
The Tree House (Boy's Rule! S.)
Bike Daredevils (Boy's Rule! S.)
Bungy Jumping (The Xtreme World of Billy Kool S., #3)
Snowboarding (The Xtreme World of Billy Kool S., #4)
Extreme Sports (The Xtreme World of Billy Kool S.)
Whitewater Rafting (The Xtreme World of Billy Kool S., #2)
Football Legend (Toocool)
Rodeo Cowboy (Toocool)
Tennis Ace (Boy's Rule! S.) (Toocool)
Golfing Giant (Toocool)
Beach Patrol (Toocool)
Space Captain - TooCool Series (Toocool)