Once you reach that score, the game essentially becomes an endless runner, with no further changes in gameplay. After 99999 score, the dino game resets your score back to 0 but the speed is set to 6000. And, this happens every time you reach 99999 score.
Hack
Code
Speed
Runner.instance_.setSpeed(speed)
Jump
Runner.instance_.tRex.setJumpVelocity(jumping_height)
Invincibility
Runner.prototype.gameOver = function (){}