For beating the World record you'll get a 25€ discount code from kendama.cz.
Trick that will check your Lighthouse consistence the best is Lighthouse flip. To get the gold badge you must do 20 consecutive Lighthouse flips, 5 for the silver badge and 1 for the bronze one. No string modification by hand is allowed but you can go stringless. You don’t have to wait between flips but you must have Lighthouse under control. You can do insta flips if you like but you must keep the style (if you start with instas you must continue with instas until the end).
More about gradings at Grading.