- ONE MILLION NUMBERS – The Extreme Number Search Challenge: THE HORIZON - EASY TRAINING EDITION Volume 1 Numbers 1 - 3,000
- ONE MILLION NUMBERS – The Extreme Number Search Challenge: THE HORIZON - EASY TRAINING EDITION Volume 9 Numbers 24,001 - 27,000
- ONE MILLION NUMBERS – The Extreme Number Search Challenge: THE HORIZON - EASY TRAINING EDITION Volume 8 Numbers 21,001 - 24,000
- ONE MILLION NUMBERS – The Extreme Number Search Challenge: THE HORIZON - EASY TRAINING EDITION Volume 6 Numbers 15,001 - 18,000
- ONE MILLION NUMBERS – The Extreme Number Search Challenge: THE HORIZON - EASY TRAINING EDITION Volume 7 Numbers 18,001 - 21,000














