Outbreak Survival! [Mystery Update Day 3, 4, 5 and 6]
On the 3rd day the Wizard Weapon set was released. However it wasn't until a later update that it was put on sale.
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On the 4th day, the Space Marauder weapon set was revealed. Same as above, it wasn't put on sale until later.
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On the 5th day, a new Zombie was revealed. It was the Ice Zombie, which at the time its stats were:700 HP, 14 Walkspeed, and 22 Damage per touch.
Finally on the 6th day, The last image was revealed...
It was the Striker Zombie, a new Zombie class that was unlocked at 3:30 and was an extremely fast, high damage dealing Zombie. It's purpose was to chase down runners in the last minutes of the game. It had very low health however, this was to make it easy to deal with on its own and in groups.
The two weapon sets that weren't on sale were then put on sale.
Once all the days were revealed the thumbnail was replaced with this one, to show all the unlocked classes / sets.
And that was it for the Mystery Update event, it is still the most popular content update to date, and was responsible for shooting the game up to the front page for just over a week.
