The background music is "Delta Force 5: Black Hawk Down".

The "Crossfire" game is a first-person shooting game developed by South Korea's Smile and operated by Shenzhen Tencent Computer Systems Co., Ltd. In the Terminator mode map, one player will become a Terminator at the beginning of each round. In addition to huge changes in appearance, the Terminator also has special skills.

The last few survivors on the scene can press the "E" key to transform into mercenaries. The mercenaries can withstand multiple attacks from the biochemical ghosts until their HP is completely lost. In terminal mode, biochemical ghosts killed by melee weapons will die completely and cannot be resurrected.

In the guard challenge mode, players need to kill the mobs in each level until the final BOSS appears in the last level. The mobs will appear indefinitely until the player kills the final BOSS and protects the base. That is, Passable.