New Event Mode! Virus Samples has been added to SAS 4. Kill zombies and collect the samples they leave behind, beat other players and win big rewards!. SAS: Zombie Assault 4, also referred to as SAS 4 or ZA4, is the fourth game in the main SAS Rating : PG. Kongregate free online game SAS: Zombie Assault 4 - The year is , and a virus outbreak on the trans-federation planet of Thera threatens.
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SAS Zombie Assault 4: New Mission! Ice Station
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