Single-players who become The Mark must take the role of two characters and save London from nuclear annihilation. The action unfolds in multiple chapters, levels, and perspectives with varying styles of play. Set in modern day, two operatives named Hawke and Fletch are sent to stop terrorists from turning Europe's largest city into rubble. Players will guide each avatar through a distinct campaign of six chapters and 18 levels. Switching between the two heroes, gamers can play out a solo game in 32 different ways.
Taking the role of Hawke players gain access to night vision goggles and a special weapon. Hawke is a mercenary who is hired to protect Fletch from harm and help stop the terrorists. Fletch is a weapon expert sent in to abort the nuclear missiles launch procedure. He is capable of super-fast action for short amounts of time. Internet play is available through a LAN or WAN connection, and gamers can storm a variety of specially designed battlefields in "Cooperative," "Team Deathmatch," and "Map Control" mode.