Blade is a well-made 3D slash-em-up game similar to Mortal Combat. It has nice 3D graphics and realistic sound effects, and still plays well on a 4-year old computer.
You can play against a human player or the computer. The controls are kind of awkward--you must use the keys on the number pad to control your character. 1 and 4 block, while 5 and 2 attack. (Don't forget to turn 'Num Lock' on!) But apparently a joystick works as well.
The bottom line: good graphics and gameplay, weird controls, but overall worth the download.