What is Hitman 3 Cloud Version? The Cloud Version is actually the Switch "port" of Hitman 3, and is a clever workaround for the hardware limitation of the Nintendo console.
What is Hitman 3 Cloud Version?
The Cloud Version takes up only 44 MB on your system, and most of the heavy lifting will be done server-side, letting you enjoy Hitman 3 whenever you have a good internet connection. There will inevitably be some fidelity loss, but Hitman is a more methodical game that isn't hampered too much by the baggage that comes with streaming.
The game client is free to download, and has you play a small tutorial to determine if your internet can handle streaming the game. Only after you've played through this trial can you choose to buy. It's a welcome, consumer-friendly decision to prevent people from buying something they can't play.
Unfortunately, this means you won't really be able to play Hitman 3 on the go, since you'll need quite some bandwidth to be able to play the game smoothly. To maximize your streaming experience, you can hook up your Switch to a wired connection.
Most USB-Ethernet adapters will work with the Switch as long as it uses the AX88772 or AX88179 chipset. While the Switch has a USB 3.0 port on the back of the dock, it's still limited to 2.0 transfer speeds so you don't need to splurge on an adapter. You can play it safe with the official Hori one, too.
The game being cloud-based has some issues that are expected for the platform. Any problems on the server will affect how you play, and you won't be able to continue playing when the servers go down or when support stops years from now.