many varieties of kit kat have existed, either permanently or as limited editions, such as those sold to commemorate festivals such as st. valentine's day. in japan, nestlé has introduced over 200 different flavours since 2000, including ginger ale, soy sauce, creme brulee, green tea, sake, and banana. the flavours are designed to appeal to younger buyers, and are often bought as good-luck gifts as the brand name echoes the japanese phrase "kitto katsu", roughly translating as "surely win."