GameSpy GBA

Review, by Phil Theobald: "It's a shame that Topsy-Turvy feels so bland, because there are some solid ideas underneath the dull stages and poorly implemented technology." [Score: 2 out of 5]
http://gba.gamespy.com/gameboy-advance/yoshi-universal-gravitation/624422p1.html

IGN GBA

Review, by Craig Harris: "The tilt concept most likely looked great in a design document, but in practice the idea makes everything feel forcefully clunky." [Score: 5 out of 10]
http://gameboy.ign.com/articles/624/624425p1.html

GameFAQs

Data, FAQs, cheats, and a message board.
http://www.gamefaqs.com/portable/gbadvance/data/924381.html

GameSpot

Review, by Justin Calvert: "It's not a bad game by any means; it's just a repetitive and disappointingly short one." [Score: 6.6 out of 10]
http://www.gamespot.com/gba/action/yoshinobanyuuinryoku/review.html

1UP

Review, by Jeremy Parish: "Yoshi's latest adventure simply proves that it really doesn't matter which way you look at a mediocre game -- it's boring from every angle, and no amount of spin can prove otherwise." [Score: 4 out of 10]
http://www.1up.com/do/reviewPage?cId=3141173&did=1

Planet GameCube

Review, by Mike Sklens: "Yoshi Topsy-Turvy takes a shot at being new and original, and while it is, it’s just not tons of fun. The first half is a bit too easy, and the second half is annoying and frustrating." [Score: 6 out of 10]
http://www.planetgamecube.com/reviews.cfm?action=profile&id=627

Eurogamer

Review, by Tom Bramwell: "I'd recommend trying it out because it deserves an audience, and some people will have a lot more luck with it than I did, but you should consider this a cautious recommendation. It's certainly not universally appealing." [Score:
http://www.eurogamer.net/article.php?article_id=59000