In addition to the similar games listed above, which have been linked to this game specifically in the database, you may find games with a similar theme to Crossfire X in the following lists:
Battle Royale games are played online against 100's of other players. They blend different genres of games: survival, exploration, adventure, shooting and scavenging while introducing the last-man-standing gameplay.
They are usually played in an arena where players start with basic equipment and aim to kill all the other players. The arena area shrinks as play proceeds to bring the game to a crescendo.
"The name for the genre is taken from the 2000 Japanese film Battle Royale, itself based on the novel of the same name, which presents a similar theme of a last-man-standing competition in a shrinking play zone." - Wikipedia
Some shooting games focus on quick reflexes and super-fast reactions. Others aim to recreate a realistic feel of the battle. One way they do this is to encourage players to communicate with each other to win.
Squad based shooting games pit large groups of players against each other, and then split each side into smaller squads or platoons of players. Each squad needs to communicate with each other to stay alive. But also, each group must communicate with each other to coordinate their attacks -- often via a leader selected in each squad.
There are also some offline games that focus on the squad as the gameplay mechanic. Games like Spec Ops: The Line
develop a connection between the player and their comrades for narrative effect.