Challenge Game

CreateSpace Independent Publishing Platform

Challenges for Games Designers: Non-Digital Exercises for Video Game Designers

SmartGames

Smart Games - IQ Fit, Puzzle Game with 120 Challenges, 6+ Years

Liars Club                                      

Big B Stats Roblox Challenge                    

NEW GAME!                                        

Independently published

CHALLENGE GAME: How many famous worldwide monuments do you know?

SmartGames

SmartGames - Coral Reef, Magnetic Puzzle Game with 48 Challenges, 4+ Years

Challenge the Game                              

Bradley & Brougham Publishing

The Game & the Challenge (English Edition)      

Witte Leeuw

De Game Challenge (Dutch Edition)