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Smart Steering Mechanics of Mario Kart World

Two recent patent publications present how Smart Steering functions in Mario Kart World:

  • The game looks “a certain distance” ahead of player kart, and identifies the rightmost and leftmost points (Pa and Pb in image 1 below) of the path. Between these points is the appropriate range (AR).
  • If the kart is heading beyond the AR, the user’s steering input is adjusted toward either Pa or Pb, whichever is closer.
  • When approaching a fork, the rightmost point of right path and leftmost point of left path are used to determine AR (image 2).
Drawing from patent US 20260097304: FIG. 13 is an example non-limiting diagram illustrating an example of steering-wheel correction while the player object 50 is traveling on a single course path
Drawing from patent US 20260097304: FIG. 14 is an example non-limiting diagram illustrating steering-wheel correction in a case where a course path splits into two paths
  • If the kart is heading toward the wrong direction, a “forcible correction” will overwrite—not just adjust—the user input to turn it around (image 1 below).
  • [Two adjacent paths w/ different heights] When the kart is on the lower path, Smart Steering keeps it in the lower path (btw 42R & 42L; image 2).
Drawing from patent US 20260097304: FIG. 15 is an example non-limiting diagram showing forcible correction when the player object 50 is traveling in a wrong direction
Drawing from patent US 20260097310: FIG. 8 is an example non-limiting diagram illustrating an example of movement correction when a player object 50 is present on a lower course path in a case where two course paths having a height difference are adjacent to each other
  • [Two adjacent paths w/ different heights] When the kart is on the higher path, Smart Steering considers both paths (btw 42R & 43L; image 1 below).
  • [Two adjacent paths w/ different heights] If the kart performs a jump when on the lower path, Smart Steering considers both paths (btw 42R & 43L; image 2).
Drawing from patent US 20260097310: FIG. 9 is an example non-limiting diagram illustrating an example of movement correction when the player object 50 is present on a higher course path in a case where two course paths having a height difference are adjacent to each other
Drawing from patent US 20260097310: FIG. 10 is an example non-limiting diagram illustrating an example of movement correction when the player object 50 present on a lower course path performs a jump action, in a case where two course paths having a height difference are adjacent to each other
  • When an adjacent path is on a speed reduction field (e.g., dirt), Smart Steering keeps you away (staying btw 44R & 44L; image 1 below).
  • If you’re using an item (or Auto-Use Item is enabled) to negate speed penalty (e.g., mushroom), Smart Steering now expands into the dirt area (btw 45R & 44L; image 2).
Drawing from patent US 20260097310: FIG. 11 is an example non-limiting diagram illustrating an example of movement correction when the player object 50 is not in a state of being able to use an item X1 and an effect of the item X1 is not exerted
Drawing from patent US 20260097310: FIG. 12 is an example non-limiting diagram illustrating an example of movement correction when the player object 50 is in a state of being able to use the item X1 or in a state of using the item X1

Refer to the patent applications for further details, such as the calculation of path curves (images below): US20260097304, US20260097310

Drawing from patent US 20260097304: FIG. 20 is an example non-limiting diagram illustrating a method for calculating a course right end line and a course left end line of a single course path
Drawing from patent US 20260097304: FIG. 21 is an example non-limiting diagram illustrating a method for calculating curves at a part splitting into a plurality of course paths

[Originally posted on 2026-04-13 Pacific Time]