In the last Christmas update, players can enter the Arena as many times as they wish. There are infinite waves but each wave contains 25 zombies. Each wave completion rewards the player with different types of rewards.
In the 1.5.0 patch all three maps were unlocked.
After every wave survived the player will be given a 15 second break. This break can be used to prepare for the next wave by refilling ammo, replenish health, or buy a random special power-ups such as the Head Flator X1, Damage Booster, or Speed Booster that will last until the end of the next wave. Stations are provided for the power-ups. Every 5th wave, one or two Hulk Zombies will appear, depending on the wave. Surviving the 'boss' wave will reward the player with special items (casino chips or a large sum of money). After every five waves, the zombies receive a health increase.
On the Bloody Subway and Haunted Graveyard maps, money must be spent to open gates to reach the power-ups, ammo, or health refill locations.
- This mode was introduced in the 1.1.0 patch.
- The other two maps were added in the 1.5.0 update.