We have proposed EARLI (Extended Asymmetrical Reverse Lateral Inhibition) which is a behavior of snake robot's obstacle aided locomotion. The idea of EARLI starts with an original idea of lateral inhibition. Joints rotate in reverse direction compared with the original lateral inhibition. Information of contact affects not only adjacent joints but also a couple of neighboring joints away from the contacting link. Distribution of torque are empirically set asymmetrically in order to propel a snake robot forward. The algorithm of EARLI is implemented to a model of snake robot in ODE (Open Dynamics Engine) to see its behavior and to verify its effectiveness. In this paper, we introduce randomized EARLI to avoid getting stuck in crowded obstacles when the snake robot uses only one pattern of EARLI. In addition, efficiency of the snake robot's locomotion is evaluated by measuring power of snake robot's joints. It is verified that the snake robot can move in crowded obstacles effectively by using random EARLI behavior.