This is a 3D action fighting game called Gladiator True Story. You play as Bruticus and fight other Gladiators in a stadium.
Make the field a bloodbath where you will enjoy killing people. As you play, you'll earn new upgrades. You will keep getting better if you get a new sword and armor. You'll get a score for each enemy you kill, which you can then send to other players to see how you stack up against them.
Have fun and good luck!