Full 2025 Guide to Successfully Sudoku Puzzles Books

There are many ways to earn money on Amazon KDP, but very few niches offer the stability, longevity, and predictable earnings that puzzle books do. While many beginners chase journals, notebooks, and coloring books, seasoned publishers quietly build durable incomes with Sudoku, Word Search, Crosswords, Mazes, Cryptograms, and mixed activity books that sell year-round. I’ve spent more than a decade analyzing puzzle niches, helping publishers build catalogs, optimizing listings, and studying buyer behavior.

The Ultimate 2025 Guide to Word Search Puzzles

Among all puzzle niches on Amazon KDP, Word Search books stand out as one of the most profitable, beginner-friendly, and evergreen. While many new publishers chase planners, gratitude journals, or coloring books—formats that rise and collapse with trends—Word Search books quietly bring in steady royalties year-round. They appeal to kids, adults, seniors, teachers, travelers, and hobbyists. They are used for entertainment, cognitive training, ESL classes, therapy, and gifts. This creates a unique combination of consistent demand and extremely wide audience reach.

5 Simple Ways to Attract Reviews

If you publish on Amazon — whether through KDP or FBA — you already understand how intense and unforgiving the marketplace can be. Every day, your book or product is placed side by side with thousands of competing listings, many of which come from seasoned sellers with large audiences, refined marketing funnels, or simply more time and budget to invest into visibility. Shoppers who land on Amazon aren’t leisurely browsing; they make decisions in seconds. In that short moment, they rapidly scan the page, judge whether the listing feels trustworthy, and decide whether it’s worth clicking or whether they should immediately move on to another result. In those few seconds, one thing matters more than almost anything else:

What Decide the Fate of Your Amazon Sales?

After more than ten years of publishing and selling books on Amazon, I’ve noticed a pattern that stays the same no matter how much the platform changes. As authors, we look at our listings through the lens of everything we’ve poured into them. We focus on the polished cover we worked on for weeks, the title we rewrote a dozen times, and the description we refined until every sentence felt right. To us, these elements represent months — sometimes years — of effort, creativity, and personal investment.

The Brutally Honest 2025 Guide

Few niches have exploded on Amazon KDP as rapidly as low-content books: notebooks, planners, journals, trackers, guest books, log books, affirmation books, handwriting practice sheets, gratitude journals, habit trackers, and dozens of other formats. For years, thousands of beginners have been drawn to them because they appear “easy”: no writing, no editing, no research—just upload and earn.

But reality is different.

The truth is that low-content books are now one of the most challenging, oversaturated, low-margin, and marketing-intensive categories on Amazon. The barrier to entry is low, meaning competition is extreme. At the same time, buyers rarely leave reviews, advertising costs are high, and organic visibility is almost impossible without strong branding.