Where it comes from
Konami Digital Entertainment press release: Yu-Gi-Oh TCG 25 billion cards sold Konami Digital Entertainment, Inc. via Anime News Network · 17 June 2011 Open the original ↗
The line in the source
In July 2009, Guinness World Records announced that the best-selling trading card game of all time (over 22 billion)
Related figures
The same measure, other periods