Put your skills to the ultimate test in three endless survival missions with online leaderboards! (xboxgamerreviews.com)
The game is primarily a single player story experience, with a battle mode to fight AI controlled enemies, other players via ad hoc mode, and survival missions as well. (cogconnected.com)
These quests could unintentionally be completed by finishing a 3 - day 15, 40 or 70 zone survival mission. (gamewatcher.com)