Game Modes

There are currently 4 main categories of game modes within UAC, as of patch 4.4. Each category offers different mechanics and a different experience playing the game.

## Campaign

The Campaign modes are separated into 2 different story lines: the main story of UAC, and the PMC story. The main Campaign offers 5 different difficulty levels: Recruit, Normal, Hard, Insane and Nightmare. The difficulty setting adjusts the stats of zombies and the parameters of missions that you are given, but also provides a greater experience reward in return. The PMC campaign does not have any alternate difficulty settings.

* Main Story - Deploy in the defense of AO Thalim, where reports of infection have been received. Cooperate with the local garrison and police forces to keep the land free of the undead. The recommended way to play UAC, with different difficulty levels to adjust for how experienced the players are and balanced rewards. If Nightmare is completed without failing any missions (not including bonus missions), a bonus Epilogue Chapter can be played for additional unlockables.
* PMC Campaign - The main opponent in this storyline is the mysterious PMC, who will employ entire battalions of soldiers and highly advanced technology in order to control the area at any cost. Provides less experience than the main story, however has several exclusive unlocks.

## Survival

Survival modes are the challenge runs of UAC. The objective is to survive 50 minutes while the game spawn hordes of zombies all around *AO Thalim*. These are currently the most popular modes.

* Survival - the classic survival experience. You must survive against hoards of undead for 50 minutes, progressively getting harder over time. After which you can either reach the evac shuttle or outlast the final 2 minute countdown to win.
* PMC Survival - similar to the regular Survival mode, but with the addition of PMC hostiles. The same victory conditions are present: survive until 50 minutes and then reach the evac shuttle, or outlast the final 2 minute countdown.
* Boss Mode - A 50-minute gauntlet of boss waves that spawn every 5 minutes. The game only ends when you have killed the final boss.
* Endless - Endless mode refers to the bonus stats that T1 zombies gain every 8min of the game, IL limit also grows with time.

\*\* Caution:For PMC Survival beware not to activate RA gate before 45min, if it is activated before 45min, a huge pmc spawns will arrive together with deadly Helicopters.

## Invasion

Invasion is a challenging game mode where you must survive against 8 themed waves of undead and then the final boss wave. Each wave spawns every 5 minutes, with the first wave beginning at 5 in-game minutes and the final boss wave at 50 minutes. The order of these waves is randomised, and the difficulty scales based on the number of players ingame and the game time at which they start. Invasion also features a shop system based around *credits* which are occasionally given out as time progresses. A credit pack is also spawned at a random position on the map every minute, which awards a further 100 credits to all players when any player (or I.S. bots/mini's) moves over it. Credits are used to purchase items from an ingame shop, which is located to the top left of the screen. Purchased items are dropped off randomly at five specified areas around the map.

## Sandbox

The Sandbox mode is intended for testing purposes, and provides a number of useful commands to players to allow setting up specific scenarios ingame. There are 2 versions of sandbox: Simulation or Pure Sandbox. Simulation mode leaves the map the same as in regular game modes, while Pure Sandbox removes most units and destructibles on the map.

SandBox command list