Original sentence: The three game modes are Smack Attack, in which players attack other players and/or computer players to gain a certain number of points first; Gate Relay, in which players race to checkpoints; and Flag Rally, in which players race to collect flags  Smack Attack is the only mode not initially locked
Edited sentence: Smack Attack is the only mode not initially locked.The three game modes are Smack Attack, in which players attack other players and/or computer players to gain a certain number of points first; Gate Relay, in which players race to checkpoints; and Flag Rally, in which players race to collect flags