It's the most advanced computer role-playing game ever: When you play you're really therein a dark dream teeming with evil creatures, danger-filled fortresses, and malevolent sorceries. The game plugs directly into your brainno keyboard, no modem, no monitor. And for game hacker Arvin Rizalli and his friends, no cash up front, no questions asked . . . and no hope of rescue when the game goes horribly, deathly wrong.