The Week in iOS Apps: Injustice 2 brings home superhero mayhem

This week’s roundup includes a new sequel to a popular superhero game. Plus, apps to help you sleep, curb your anxiety, and get the best “golden hour” pictures.

If you loved the DC superhero-vs-DC superhero throwdowns of Injustice, Injustice 2 (free, in-app purchases, iPhone and iPad) is here to give you more thrills, with new characters, new fighting modes, and an epic storyline. It’s also an epic memory hog: Make sure you’ve got at least 1 GB free on your device before downloading this game.

Annotable 2 (free, in-app purchases, iPhone and iPad) is the latest version of the popular iOS annotation app. The update offers support for multiple languages, a customizable toolbox, a “size slider” that lets you adjust line width and font size on documents, and more.

Art Passport (free, iPhone) gives you “stunning 360-degree panoramas of modern and contemporary art exhibitions from the world’s leading galleries and museums.” It’s compatible with Google Cardboard, if you want to immerse yourself in a virtual-reality version of those museums.

Golden Hour One ($4, iPhone and iPad) is a weather app for photographers and photography buffs, identifying the precise “golden” hour at locations so they can get the best light they need for the perfect picture. The latest update offers support for German locations, as well as some bug fixes.

Joyable (free, iPhone) promises to help you reduce anxiety through the use of cognitive behavioral therapy. Download and take a quiz about yourself, then you’ll receive assigned five-minute activities to help you through the process of learning to control your more extreme emotions. You’ll work with a coach to set goals and measure progress.

PDF Expert ($10, iPhone and iPad) has launched in Version 6.0., with new features that let users edit and modify PDF text, add and replace images, add links to text and pictures, and hide sensitive information using the Redact feature. Other new features include the ability to password protect specific PDFs that contain sensitive data.

Sleep Orbit (free, in-app purchases, iPhone and iPad) lets you mix and match sounds to create a kind of customized white noise to help you sleep, drown out distractions, and generally feel a little more zen.

Zones (free, in-app purchases, iPhone) has launched in Version 2.0. The app always let you convert the time differences between cities—it must be 6 a.m. in London!—but the recent update expands the city database and adds more customized user interface options.

Artificial Intelligence ($3, top) is a game that lets you build the world’s first sentient supercomputer … Penarium ($2, bottom) is an arcade game set in a “sinister circus arena” … Pengy Has a Dream ($3, left) gives flight to flightless waterfoul.