Crossing the Fire Line is a first-person shooter game, developed by Korean Smile Gate and operated by Tencent in Chinese mainland.
Players can choose weapons according to their own preferences. Every time they start a new round or come back to life, they can exchange their backpacks for the right set of equipment. Each person can use up to seven backpacks (the default is two, other backpacks need to be purchased by themselves).
The system effectively makes up for the monotony that only one weapon can be used before the end of the game.
Greatly improved the fun of the game.
"Extreme Combat Backpack" (available only through Phantom Prop Card) allows players to switch backpacks at will in challenge mode.