Yoshi’s Universal Gravitation (ヨッシーの万有引力, Yosshī no Ban’yū Inryoku) also known as Yoshi Topsy-Turvy in North America, is a platformer for the Game Boy Advance that was developed by Artoon and published by Nintendo, starring Yoshi. It features a built-in tilt sensor, which is used to manipulate the game’s environment. By tilting the Game Boy Advance left or right, the player can tilt the game area, causing enemies and other objects to slide as the direction of gravity changes. This gameplay mechanic is used to solve puzzles or aid Yoshi in completing levels. Due to the tilt-sensing device that is required for gameplay, this game is one of the few Game Boy Advance titles that is not compatible with the Game Boy Player for the Nintendo GameCube.
The plot and graphics are similar to that of Yoshi’s Story for the N64.
When Bowser starts eating tacos on Yoshi’s Island, an ugly book spirit named Hongo traps the entire island within the pages of a storybook. Only by giving Bowser a taco Yoshi can convince Hongo to release the rest of the island, so he sets out to progress through the chapters of the book.
Each course is controlled by a spirit, each with an obsession — one loves money, one loves fast things, one loves friendliness, one loves strength, etc. They will set out guidelines for the course, such as collecting fruit to free a certain number of Egglings, finishing a course before time runs out, finding a certain number of coins or defeating — or not defeating — a certain number of enemies. By satisfying that spirit’s requirements, players pass the course.
Yoshi can jump and stick out his tongue to eat fruit or enemies, but the main feature of the game is the tilt mechanism. By moving the Game Boy Advance side to side, players tilt the world around Yoshi, causing enemies to roll around, swinging ships and pendulums, and bouncing items all over the place. An impassable wall will become a climbable slope, or a rolled-up carpet will become a long platform. Each environment requires players to master not only button presses but also tilt movements to progress.
| Developer(s) | Artoon |
| Publisher(s) | Nintendo |
| Series | Yoshi |
| Platform(s) | Game Boy Advance |
| Release date(s) | JPN December 9, 2004 EU April 22, 2005 NA June 13, 2005 |
| Genre(s) | Platformer |
| Mode(s) | Single player |
| Rating(s) | ESRB: E CERO: A OFLC: G PEGI: 3+ |
| Media | Tilt-SensorCartridge |
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