How can I obtain Frenzy mode in Mario Kart Tour?

To obtain Frenzy mode in Mario Kart Tour, players must select a character that has a favored course for the current race. Each character has a specific set of favored courses where they can get three item slots instead of the usual one or two. When a racer with three item slots hits an item box, they have a chance to receive three of the same item, which triggers Frenzy mode. During Frenzy mode, the player becomes temporarily invincible to all attacks and obstacles, can use the triggered item an unlimited number of times, and gains increased points for actions performed. To maximize the opportunities for Frenzy mode, players should upgrade their characters, karts, and gliders to increase their chances of getting three of the same items in races on favored courses.