2x Multiplier is a power-up in Subway Surfers. When picked up, the score multiplier is doubled, allowing the player to get double the amount of points in a specific period of time. For instance, if the score multiplier is X5, it will be X10 when the power-up is picked up. It is a yellow star with '2x' written on it.
They can also jump on top of the trains and surf with hoverboards to evade capture until the character crashes into an obstacle, gets caught by the inspector, or gets hit by a train, at which point the game ends.