said at that time the team was not working on Tekken 6 full-time because they were busy developing Tekken Dark Resurrection. Harada's main concern with Tekken 6 was that it appeal to newcomers and older players. The game was released in Japanese arcades on November 26, 2007. It was the first game running on the PlayStation 3-based System 357 arcade board. Both versions also saw a limited release in North America. Harada said Namco decided to make a Tekken installment for the Xbox 360 because of multiple fan requests. Response to the original arcade game was highly positive, but Harada said the team aimed to make more improvements to attract new players. He noted that feedback from the arcade's release in Japan had surpassed that of previous titles. For the updated release, the team wanted to include more playable characters than in Tekken 5, make the techniques unique as well as more intuitive, and make the fights as brutal as possible. The game uses a proprietary graphics engine running at 60 frames per second as well as a dynamic physics engine named the "Octave Engine", which simulates fluid dynamics and among other things, allows water to behave realistically according to how the characters move. The graphics engine has been designed with a focus on character-animation to make movements look smoother and more realistic. This led to many animations being remade to either reflect the impact and damage caused, or to create new possibilities in gameplay. The developers considered animation extremely important for a fighting game and wanted to make the game "look good in motion", whereas previous installments had been designed to "look good on still shots". Since Bloodline Rebellion, the game has supported dynamic full-body motion blur, making Tekken 6 the first fighting game to do so. Harada revealed they had encountered difficulties making the cast balanced. As a result, Namco took notes from the characters' victories in the original arcades and modified the cast and rebalanced the game. To make battles more strategic, the Rage system was created. Another new element is the use of items by the characters. While Harada did not find this as unique as the Rage System, he felt it added more to the battles' fun factor. Like some games in the Mortal Kombat series, Tekken 6 is notable for adding the element that allows players to throw enemies down to another area of