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Browsing the App Store this weekend?  Here are ten new or updated apps for the iPhone and iPad worth taking a closer look at if you are:

Epic Citadel.

The demo of the demo shown at this week’s Apple event, Epic Citadel lets you wander around a virtual town and bask in the glory that is Epic’s Unreal Engine 3.  It’s not for the 3G or early iPod Touches though.  Free.

Twitter for iPad.

Version 3.1 finally brings the official Twitter app to the iPad.  Existing users will only need to upgrade, but if you haven’t tried this already, hit the link above.  The interface is very clever and looks great, bringing tweets and the web together in one application.  Free.

Spider-Man: Total Mayhem.

Another great looking action game from Gameloft.  Based around the Ultimate Spider-Man universe, there are 12 levels filled with familiar enemies which Spidey must fight off, using up to 20 different combination moves and his slow-motion Spider-Sense.  $6.99/£3.99.

Katy Perry Revenge.

The latest in the Revenge series brings Katy Perry to the party, with six of her hit songs included in the price.  The gameplay will be familiar but just like their other themed titles, it’s filled with great graphics and various extras.  $4.99/£2.99.

Spectra Magazine.

A monthly collection of four science fiction, fantasy and horror short stories.  The price may look high, but that’s because it includes six issues, working out at around $2 each.  The magazine also has news, reviews and interviews and is available for both the iPhone and the iPad for the same price.  $13.99/£7.99.

InCrowd.

Connected with Facebook Places, this game lets you create an avatar, greet your friends, check-in at locations and work on increasing your popularity score.  Free.

Terminology Ph.

As seen on the iPad, the dictionary and thesaurus app is now available on the iPhone and for a limited time, it’s $0.99.  $0.99/£0.59.

Aliens Need Brains.

An iPhone 4-only game with Retina Display-tuned graphics and a gyroscope-operated aiming system.  Lots of crazy weapons and equally crazy Battle Bears-style gameplay await.  $1.99/£1.19.

Total Film.

The official iPhone app for the UK film magazine, with the latest reviews, a searchable archive of 8000 older reviews, a cinema finder and the latest magazine features too.  UK-Only £1.79.

Fireman Panic.

Catch the people who are leaping out of a burning building!  $0.99/£0.59.