For beating the World record you'll get a 25€ discount code from kendama.cz (only in case of gold badge).
To get the gold badge you must do 20 consecutive UFOs, 5 for the silver badge and 1 for the bronze one. No ken adjustment is allowed. Tama grip adjustment is allowed (not cool). Allowed tolerance from horizontal (flat) position is 10°. You can go stringless.
More about gradings at Grading.