Free iPhone and iPad games: Duke Nukem 3D, Feed Me Oil

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.

If you aren't familiar with foul-mouthed action hero Duke Nukem, you must have been living under a rock or walking around with your eyes closed for the past decade.

In this instalment of the Duke Nukem franchise, you are pitted against waves of alien scum, who've invaded downtown Los Angeles in the hope of snatching pretty women and breeding with them.

Naturally, Duke has a whole range of weapons that he can use to dispatch his foes, and an even larger arsenal of witty one-liners.

Your aim in this addictive physics-puzzler is to guide oil from broken pipes into the mouths of strange creatures, with the additional goal of nabbing a three-star rating and a high score.

You'll need to complete this game's large collection of levels without spilling or wasting lots of the black gold if you want to compete for a place on its global leaderboards.

There are also achievements to unlock as you play.