Extremely unforgiving, intensely demanding, and a whole lot of fun. Spelunky is one of the most memorable and brutal co-op experiences I've ever played. One wrong move and you're dead, but the same goes for every obstacle and enemy in your path.

There's definitely a harsh learning curve, but once you start getting deeper into the game, it really thrives. This will not be for everyone and it's certainly not perfect, but I'm a fan.