Tips (US$1.99)

This application has a very simple purpose: to help parties figure out tips for restaurant bills. It's a single-screen application that's exactly what you want during what is perhaps the most stressful part of eating out: figuring out the bill.

Upon launching the app, you're faced with a blank subtotal section, and the question "How much was your bill?" A service slider adjusts the tip percentage from 5 per cent to 30 per cent, and another slider adjusts party size from 1 to 12. A Tip and Total section breaks down the results, and hopefully, ends all discussions about who owes what.

Simple. Effective. And you're bound to save the US$1.99 purchase price by making sure everyone at your table pays their fare share.

Enigmo (US$9.99)

Since the first time I saw this game's opening level flyby at the Worldwide Developers Conference keynote last month, it's been on my gotta-have list. The main point of this game is to guide liquid droplets from point a to point b, with increasing levels of difficulty. With each level, you're given the task to guide liquid from its start point to its destination point, using a variety of tools and objects to help you do so.

This simple premise is extremely well-implemented, providing brain-teasing fun and 50 levels to challenge you. The game itself utilizes positional audio, takes advantage of the iPhone's multi-touch capabilities and 3D graphics -- and ties it all together with an amazing physics engine.

This game's fun factor is right up there with the best puzzle-based games. Highly recommended.

Comic Touch (US$4.99)

From the makers of Comic Life comes Comic Touch, porting some of the best features of Comic Life to surprising effect for a mobile device. Just like Comic Life, you can easily add dialogue balloons to pictures, as well as captions and even some Core Image effects. Unlike Comic Life, you do this on a 3.5-inch screen. The application is so well designed that manipulating photos and text with this app feels completely natural. Kudos to the designers for creating an interface that uses the iPhone's capabilities without adding clutter.

When you first launch Comic Life, you're prompted for an image source. After selecting your photo from the Photo Library or Camera, you can then add dialogue balloons, captions and familiar Core Image effects like budge and squeeze. Once done, you can share the results with friends via e-mail, or save the image directly to your Photo Library.

Fans of Comic Life will be fans of Comic Touch, and this application may bring in new fans of Comic Life. If you like to manipulate photos of your friends and want to do so on the go, this is certainly the perfect solution.