This is a very fast, reflexive, bloodbath of a party game. The premise is fantastically simple- You have a sword you can swing, and a gun you can shoot. Kill the other players- But the strategies build in complexity pretty quickly if you're playing with three or four people.
Within seconds, you can shoot at one enemy to your right as someone drops down above you. They go to slash, but you intercept with your sword, flinging them back up. At this point, the bullet you shot gets reflected back at you, so you jump over it and towards the guy that dropped down, swinging your sword as you jump. This propells you up into him, netting you a clean kill. But at this moment, the fourth player wraps around from the left side of the screen and shoots you. You barely just landed, and only have enough time to deflect the bullet with your sword, but the guy is already in the air, jumping over the reflected shot, bringing his sword down on you.
This takes about three or four seconds, and the default mode is 10 kills to win. If someone has at least 9 by this point, it'll enter a showdown between the victor and the close second. These arenas change depending on the stage: One can have a rain of arrows to deflect and dodge, while another turns you both invisible. The variety is fantastic.
There IS a singleplayer mode, but it's merely just a gauntlet, pitting you against waves of enemies. It's fun for a bit, but starts getting kinda monotonous. Also, there is no online. This was built for local multiplayer, and if you can take advantage of that, I can guarantee that you and your friends will sink hours at a time into this.