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Yoshi Topsy Turvy
Developer	Artoon
Publisher	Nintendo
Series	Yoshi
Released	JPN December 9, 2004 EU April 22, 2005 NA June 13, 2005
Genre	Platformer
Mode(s)	Single player
Ratings	ESRB: Everyone CERO: All ages PEGI: 3+
Platform(s)	Game Boy Advance
Media	Tilt-SensorCartridge

Yoshi's Universal Gravitation (ヨッシーの万有引力, Yosshī no Banyū 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 games that is not compatible with the Game Boy Player for the Nintendo GameCube.

The plot is similar to that of Yoshi's Story for the N64.

When Bowser starts wreaking havoc on Yoshi's Island, a book spirit named Hongo traps the entire island within the pages of a storybook. Only by locking Bowser away can Yoshi 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. One loves money, one who loves fast things, one who 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 killing — or, not killing — 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.

By tilting the Game Boy Advance, the environment around Yoshi is rotated to knock over enemies, swing pendulums, and to help Yoshi run up walls and leap huge pits. All of Yoshi’s Island is trapped in a storybook, and only by meeting certain chapter-specific challenges can you complete the chapter. To tilt your remote control, 'round Yoshi rotated to knock over enemies, swing pendulums, and to help Yoshi run up walls and leap huge pits.

• Official site
• Yoshi Topsy-Turvy at MobyGames