Avid fans of console games are in for some good news as it is now possible to install emulators for PlayStation, N64 and Nintendo DS based games on iOS 9 without actually jailbreaking the device. The only caveat for running these games is that your iOS device must be pre-installed with iOS 9.0 through iOS 9.1 or 9.2.
It must be noted that the NDS4iOS Nintendo Emulator works well on both jailbroken and non-jailbroken iOS devices. Here is a step-by-step guide to install the emulator on iOS 9 without jailbreak:
Step 1: Launch Safari and browse to the URL: iosem.us/app/install/nds.html on your iPhone, iPad or iPod touch
Step 2: Tap Install from the top-right corner of the web page, and select the option to confirm installation on the prompts that follow. Now, the nds4ios emulator will get downloaded to your device.
Step 3: Go back to the Home screen and wait until the app completes downloading.
Step 4: Launch the Settings app and navigate to General > Profiles(General > Device Management on iOS 9.2).
Step 5: Browse for the newly added profile (the one starting with "Guangdong"), select it and tap the Trust option on the following screen. Then choose Trust again to confirm.
That completes the process of installing the emulator. You can proceed with next step to load ROMs onto it.
Note: The ROMs cannot be linked directly as they need to be ripped or loaded from some source on the web.
Step 1: Plug-in your iOS device to your computer and open iTunes.
Step 2: Select your device from the navigation bar at the top and go to the Apps section.
Step 3: Scroll down to the "File Sharing" section and select nds4ios.
Step 4: Drag and drop the .nds file of each game you want to load into the emulator onto the box under "nds4ios Documents".
Step 5: Return to the app, select the menu icon in the top-left corner followed by the ROM List to find all the games you copied to the app.
That's it. You can pick your favourite game and enjoy playing it to your satisfaction.
[Source: Redmond Pie]