Quality Index: The week's best iPhone games – World of Goo, Mission Europa, City of Secrets

Welcome to the weekly iPhone Quality Index (Qi) games round-up, giving you the LOWdown on the HIGH scorers every Friday on these illustrious pages.

As you may already know, Qi trawls the web for iPhone game reviews from the world’s most respected online and print sources.

Qi then applies its own magic formula to each site (such as 148Apps, Macworld, and Application iPhone) to establish a single definitive Qi score for each iPhone app and game.

Oozing serenely onto Qi’s chart this week in the #1 spot comes one of the most decorated indie PC hits of all-time, a trio of superlative critiques contributing to World of Goo’s delicious 9.0 Qi rating.

2D Boy’s much anticipated iPhone puzzler challenges your bridge, zeppelin, and tongue (!) construction capabilities to ensure a requisite number of the malleable globules reach the pipe, a.k.a. the exit.

The Sign Painter predicted a warm reception from across the iOS universe last Tuesday, and AppSpy duly obliged, noting that “should you get bored with the campaign you can try your hand at being ranked globally by building a tower-of-babel with the Goos you have emancipated.”

Blending elements of a first-person shooter with role-playing motifs isn’t a unique proposition - even on Apple’s smartphone - but Banshee Soft has raised the bar with the 8.7 Qi rated Mission Europa in one crucial way: vastness.

A grand total of 170 missions spread over 50 levels should keep gamers off the streets for a month or so, though the incredible range of weaponry, skills, and spells to hand may leave you shooting unwanted bullets in your sleep.

Even your combat style can be perfectly tailored in Mission Europa, a point reinforced by TouchGen: “If you want to be a melee brawler using passive skills to enhance your chances in the close encounters that is fine. If you rather want to focus on utilizing magic to fry, freeze, and blast the opponents that is up to you.”

And now for something completely different, as aideMMedia invites you to join them for a point-and-click adventure set in an underground world populated by highly intelligent burrowing mammals. Yes, it’s true.

Blind, at least initially, to the subterfuge rife throughout the City of Secrets, Rex the dog and Mr Moles the, errr, mole gradually uncover the truth, but only after solving a mountain of clues.

You can get the up-to-date information about which games are reviewing best over at the Quality Index.