Unlimited Lying Flat: Get a Full-Level Account at the Beginning

The protagonist was originally a loser in the real world, but he was accidentally involved in a global gamification incident and became an unlimited stream player. In the first level, he easily won the game by relying on the "become stronger when lying flat" system, which shocked all players. As the game progresses, he gradually discovers the truth behind the game and faces the challenge of the indigenous resistance forces. How does he choose between lying down and growing up?