Thousands of competitors from around the world have converged on Prague to compete for the Yo-Yo World Championship.
Players will spend the weekend competing in freestyle categories using up to five, yes five, yo-yos at a time.
They'll be judged on their style, accuracy, speed and precision.
Four-time world champion Hiroyuki Suzuki said that the competition is a great place to make friends.
Competitors are using some serious yo-yos, some are made from titanium with high speed ball bearings inside.
The ball bearings allow for spins to last much longer.
The Yo-Yo Championships date back to the 1930s.