The Short Version
Tetris moved from a hidden Easter egg to a fully playable game in the Retrocade app on Apple Vision Pro after a recent update.
Tetris getting its own exclusive Vision Pro environment is the clearest sign yet that developers see the headset as worth building for. No iPhone version, no iPad version, Vision Pro only. That choice costs the developer a bigger audience, but it also makes the headset feel like it has something nobody else can offer.