Hotline Miami is one of the least stealthy games I've ever played. Wearing a rubber animal mask, you kick down doors and blast your way through buildings in a bloody whirlwind of destruction. But it makes me wonder what a more sneaky approach to that format might look like - perhaps somewhat of a modern take on the original Metal Gear games (the pre-Solid, MSX ones). If you've had similar thoughts, Intravenous 2 is worth a look - and with its prologue out now as a free Steam game, you can give it a try without having to pay a thing.
