They had him cornered. They had finally taken down the masked man, holding his own explosive device. They couldn't see his face as he pulled the pin, the mask's wicked grin being his last mocking gesture. stupersteve03 is dead. He was V. You can only kill a man. You cannot kill an idea. The revolutionary's weapons, hidden in plain sight, burst into flames around them. nightprowler10 is dead. He was Keyser Soze. Teacups is dead. He was War. Rikkomas is dead. He was Mr. White. ~ stupersteve03, Rikkomas and Teacups were alive when the game ended and have won.
Short version: Steve killed everyone. This obviously ended the game. There were either 3 winners or no winner, depending on whether your interpretation of 'survive' is to make it to the end of the game, or still be alive after the end of the game, which now that I type it out seems weird and unnecessary. I think 3 winners is better than no winner. np10 definitely didn't win because he needed to be the last one remaining.