wtf is green-nx?

green-nx is a homebrew application that lets you play Xbox Cloud Gaming titles on a modified Nintendo Switch. After signing in with your Microsoft account, you can stream your Xbox Game Pass Ultimate library directly on the console. All the streaming work happens on the Switch itself, with no companion phone or PC required. The app is fully working. You can sign in, browse your game library with cover art, search for titles, and stream gameplay at 720p, 1080p, or 1080p HQ with audio and full controller input. Sign-in uses a device code method, so you never type a password on the console. Your login tokens and cached game list are stored on the SD card. Under the hood, the app handles the WebRTC streaming protocol entirely on the Switch. This includes the connection setup, encrypted media transport, and data channels for controller input. Video arrives as an H.264 stream that is decoded by the Switch's dedicated hardware decoder, then passed straight to the screen through the GPU with no intermediate memory copying. Audio uses the Opus format, and video targets 60 frames per second. To run it, you need a Switch running the Atmosphere custom firmware, an active Xbox Game Pass Ultimate subscription, and a 5 GHz Wi-Fi connection. You copy the app file to your SD card and launch it in title mode by holding R while starting an installed game, because the smaller applet mode does not have enough memory for video decoding. The app includes a settings menu for stream quality and button layout, and in-stream controls are mapped from the Switch gamepad to Xbox equivalents. The project is open source under GPL-3.0 and builds on several existing libraries for WebRTC, encryption, audio decoding, and user interface rendering. The author notes that it is an experimental, non-commercial hobby project with no affiliation to Microsoft or Nintendo, and requires your own valid Game Pass subscription.