The Arena, which is a post-apocalyptic version of the survival mode, will be available for everyone after finishing the story mode. The player has to survive waves of enemies, complete stages of the arena and perform special tasks which will be awarded with achievements.
The new mode will consist of encounters divided into smaller waves and mini-boss fights. Additionally, DLC will contain tougher challenges in the form of Boss fights. Between the battles players will be able to purchase weapons and ammunition using currency they earned on the Arena.
Dirty Arena will be a free DLC available exclusively on Steam. It will be released as a game update that will also include previously announced achievements and Cloud integration.