Free iPhone and iPad games: Percepto, Triple Defense

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.

As we've stated 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.

In Percepto, you assume the role of a small boy who falls asleep and awakens in a strange room where everything is 2D. Your aim is to escape your new confines by rotating the room in various directions.

Basically, you have to move in 2D but think in 3D to overcome puzzles, flip switches that activate moving blocks, and get your backside out of there.

Back in March, Percepto received a rather large update, which included - among other things - Game Center support.

Triple Defense is a tower defence title with a twist.

Like most titles in the TD genre, Coolagame's effort tasks you with building and upgrading various towers to repel waves of invading baddies.

Unlike most other tower defence titles, though, you upgrade your towers by combining them with other similar towers, which is a mechanic that should be familiar to anyone who's played Spry Fox's excellent puzzler Triple Town.