Left 4 Dead Cross-Play: PC and Xbox Live Are Separate – No Cross-Platform Play

Left 4 Dead on PC (via Steam) and Xbox 360 (via Xbox Live) cannot play together. They are separate platforms with no cross-play support.

How to Play Online

• PC: Matchmake via Steam with other PC players.
• Xbox 360: Play via Xbox Live with other Xbox users.

Cross-Platform Alternatives

• Left 4 Dead 2: Supports cross-play between PC and Xbox 360.
• Other Co-op Games: Deep Rock Galactic, Back 4 Blood, GTFO, etc., offer cross-platform play.