In addition to using cash for new weapons and enhancements, players can purchase special items to help them get around or deactivate security systems. The series' iconic masks return, and gamers can customize their own mask patterns and colors. The new CrimeNet database puts players in touch with a number of different criminal contacts, and dynamic scenarios ensure that heists never play out the same way twice, with some missions spanning several days. As gamers advance they can upgrade their weapons with a variety of scopes, silencers, and barrels, and they can customize their character along four different skill trees: Mastermind, Enforcer, Ghost, and Technician. Players can take control of Dallas, Hoxton, Wolf, and Chains as they knock off small-time convenience stores, rob banks, and even steal art from museums, all in the name of getting rich. Mixing gritty first-person shooting, stealth, and co-op customization and looting, Payday 2 lets up to four gamers pull off more than 30 heists in the Washington, D.C., area.