Free iPhone and iPad games: Ticket to Ride Pocket, Extinction Squad, Demolition Dash HD, and Gravity Guy HD

Welcome to another instalment of Pocket Gamer's free game round-up - a feature that highlights the top App Store titles that have been made free in the past 24 hours.

Get in quickly, though. Prices in the App Store change frequently, so grab these freebies before you miss out on a top bargain.

Remember to let us and your fellow readers know about any other great free apps in our comments section below.

Additionally, you can find out about all the latest App Store updates, price drops, and more by using the cleverly hidden hyperlink in this paragraph.

And if you're craving even more quality freebies, be sure to check out the Free App Alliance iPhone app for daily recommendations of the best free apps the App Store has to offer.

Ticket to Ride Pocket is an iPhone adaptation of the best-selling Ticket to Ride boardgame that features four different game modes: Solo, Pass-and-Play, Local, and Multi.

In Multi mode, you can play multiple asynchronous matches against opponents from around the world, and dip in and out of the action whenever you see fit.

Back in February, Ticket to Ride Pocket was updated with a USA 1910 expansion pack, which you can download through an in-app purchase.

In Extinction Squad, you take control of daredevil scientist Chuck Darwin and his elite team of zoological defenders, as they travel across the globe in search of endangered animals to rescue.

Once you've located a beast in peril, you have to unwrap your special purpose-built trampoline and bounce the little critters to safety.

You can do this in Adventure mode or Countdown mode - the latter of which pits you against the clock.

This action-packed platformer sees you guide a rather cuddly-looking little monster called Zilla through a variety of different locations - all of which have to be razed to the ground.

There are two game modes on offer here: World Rampage, which features 24 stages; and Endless, which is, of course, endless.

Miniclip's Gravity Guy is an endless-running title in which - as always - you have to sprint as far as you possibly can while avoiding your pursuers and a range of obstacles.

Luckily, you can alter gravity whenever you please, so it's a lot easier than normal to avoid the many hazards that you'll face.

Game Center is baked right into this app, and there are plenty of achievements to unlock.