Free iPhone and iPad games: Sonic & Sega All-Stars Racing, The Crystal Maze

Welcome to this week's first 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.

As we've stated many, many times before, prices in the App Store change frequently. 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.

You only really need to know two things about Sonic & Sega All-Stars Racing. One: it nabbed a Pocket Gamer Platinum Award at review. Two: it's now available for free.

In this Mario Kart-esque racer, you choose one of Sega's most iconic protagonists, put the pedal to the metal, and thrash around 16 colourful tracks in a range of different vehicles.

There are also 25 missions to complete, Bluetooth multiplayer for up to two players, and online multiplayer for you and three of your friends.

Much like the Channel 4 TV show on which it's based, The Crystal Maze for iPhone tasks you with traversing four different puzzle-filled zones - Medieval, Futuristic, Aztec, and Industrial - in order to collect special Time Crystals.

There are 21 different mini-games to compete in, which are split into four unique categories: physical, skill, mental, and mystery. Each crystal you collect during play increases the amount of time you can spend inside The Crystal Dome - the game's final challenge.

This app features the show's original theme tune; 16 classic quotes and sounds taken from the TV series; and Richard O'Brien's mug.