The 25 Best-Selling Books of All Time According to IGN

"Creating a roundup of the best-selling books of all time is harder than it sounds. Books were published in different editions & translated into multiple languages. Some received abridged editions, or were expanded into definitive ones. Some were published as serials, & then compiled into larger volumes. Others were purchased in bulk & then distributed for free. Combine this with inaccurate record-keeping, & publishers who exaggerate their sales, & we have no way of determining exact counts to make an indisputable list; too many variables & known unknowns to create something definitive. So a few self-imposed rules: We're doing literary fiction only. That means religious texts (like 'The Bible'), self-help guides, political tools, & other reference texts are out. 'The Lord of the Rings & The Count of Monte Cristo left out: the former because its original serialization makes it difficult to quantify, and the latter because its age makes it difficult to find reliable sources." - ign.com