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Install the iOS app using the App Store badge on the introduction page, or the Android app using the Google Play badge.

Put your own game files on your device. Tap + in the library to import one, then tap the game to start.

No games are included. Prepare your own dumps, and import only files you have the right to use.

See Features for each system’s formats. For PS1, select the CUE and every BIN together, or import a CHD. For 3DS, use your own decrypted .3ds, .cci, .cxi or .cia dump. ZIP can hold one cartridge game; import PSP files directly.

The app checks the file contents and skips a game it already holds. A different filename with the same contents still counts as the same game. Large PSP images are checked in a stream rather than loaded into memory whole.

On iOS, open Files and go to On My iPhone › N-EMU; on Android, open the N-EMU folder in your file manager. Games, save data, covers and PSP fonts sit in separate named folders. On iOS a game left in the ROMs folder is picked up on the next launch. On Android a game arrives only through the + button in the library, and the folder is for copying files out, deleting them, or renaming them.

An in-game save uses the game's own save feature. A save state is a snapshot of the game at a particular moment, stored separately by N-EMU. Save one from the pause menu and load it later.

Ten manual slots, plus one automatic state kept separately. A game can be set to resume from the automatic state as soon as it opens. The in-game save the game itself writes stays apart from both.

Open Manage Save Slots in the pause menu and choose Undo load to return to just before loading. Loading another state replaces that recovery point. Resetting or quitting the game clears it.

Games run without an internet connection. Internet is needed when you connect Google Drive or explicitly check, back up, restore, or clean up saves.

Export in-game saves from game information, or use Drive under Settings › Saves and backup. Prepare the same game file on the new device. States need compatible core versions, and 3DS states open only in their original installation, so save in game before moving devices.

Game files are never uploaded. Only in-game saves and save states are sent. A download checks for occupied slots first and warns before it would replace newer data on the device.

Connect up to four controllers and assign players. They also work in the library, settings, and pause menu. The number of simultaneous players depends on the game and system.

It depends on the system. The table on the features page lists the maximum for each one. Up to four controllers can be connected and assigned to separate players, and 1P can be handed to a different controller.

Position and size are adjustable, and landscape and portrait are stored separately. Physical controller buttons can be reassigned per system, per controller model, and per game.

You can choose 0.25x, 0.5x, 1x, 2x, or 3x. Sound follows the selected speed, and you can choose to mute it during fast-forward.

Try one of the three audio settings: Stability, Balanced, or Low-latency. A choice takes effect the next time a game opens. The audio route the device chooses can hold on to some delay even with Low-latency selected.

Enter codes under Tools › Cheats in the pause menu. Formats vary by system: Game Genie, GameShark, Pro Action Replay, CodeBreaker, Action Replay DS, CWCheat or raw addresses and values. Find a value can search memory. 3DS and PS1 support neither cheats nor value search.

Choose a photo or file on your device. 3DS uses the Home Menu icon contained in the game; other covers are not fetched from the internet.

Under More › Info › Game settings, select Korean font for the PSP game font, then restart the game. This may help some Korean-patched games; it does not translate the game. If kanji are also needed, you can import and select a PGF font you have the right to use.

Korean, English, Japanese, Simplified Chinese and Traditional Chinese. The app follows the device language, or you can set a language for the app on its own.

The app is free and has no in-app ads. A one-time supporter purchase unlocks three additional home-screen icons. Game compatibility and emulator features do not depend on whether you support the developer.

No. PS1 boots through PCSX-ReARMed’s HLE BIOS, and there is no BIOS-file import feature. HLE may not work with every game.

Select the M3U and all disc files together, or all discs named (Disc 1), (Disc 2) and so on. They appear as one library game. When prompted for the next disc, choose it in the pause menu’s disc row.

Choose DualShock in per-game settings, then relaunch. Both sticks and game-triggered rumble are available. Press L1, R1 and SELECT together to toggle analog mode. Some games need the digital pad.

The file cannot open in another installation: 3DS states are signed with an installation-specific key. In-game saves can move, so save in game and export before changing devices or reinstalling. Updating the app is different from reinstalling and preserves states in the same installation.