Using a decoder provides mileage points, which could be used to redeem weapons, costumes and more.
A decoder is a cash item in Counter-Strike Online and Nexon Zombies. Owning decoders through purchases, rewards or event giveaways would entitle players to win premium weapons or costumes (usually) not purchasable from the Shop. During certain events, the probability is doubled, tripled or quadrupled for contents available in the decoder(s). A decoder comes in many types which possess different attributes, such as providing mileage points and different contents.
Whenever a player uses a decoder, there are four possible tiers which are assigned to the rarity of the item(s) gained:
|NONE||Item received has an expiry date.|
|Item received has an expiry date but is of higher quality, including permanent sprays.|
|Item received is permanent. Applies to mainly craftable weapons and common character skins.|
|Item received is of permanent and premium quality. Applies to mainly (non-craftable) golden weapons, rare character skins and event-exclusive items.|
ADVANCED or PREMIUM-tier winnings are broadcasted to other players on the server.
In addition, mileage points are rewarded upon each decoder usage, which are then used to redeem other weapons, costumes, enhancements and characters from the 5x5 Bingo Board. The amount of mileage varies between decoders. The Bingo Board is a permanent feature, with a main prize rewarded upon successfully shading all numbers. Take note that mileage points have no expiry date.
The Board comes with seven functions as shown below:
|Open Random||Randomly draws a number from 0 - 99, with duplicates. Costs 50 mileage.|
|Open Even||Randomly draws an EVEN number from 0 - 98, with duplicates. Costs 100 mileage.|
|Open Odd||Randomly draws an ODD number from 1 - 99, with duplicates. Costs 100 mileage.|
|Open Special||Randomly draws a number from the board with no duplicates. Costs 350 mileage, but it increases when more rows are cleared.|
|Reset Board||Replaces current board with a new set (of numbers). Costs 50 mileage.|
|Change Main Prize||Replaces current grand prize with a new one. Costs 350 mileage, but usable for free once a month. Once all numbers on the board have been shaded, it gets replaced by "Claim Main Prize".|
|Overall Reset||Only usable once during certain events, without cost. Both Bingo board and the main prize would be replaced with a new one.|
While mileage points are primarily sourced from decoders, there are mileage giveaway events that do not require the use of any decoders. The image below displays a mileage coupon earned from just accumulating 30 minutes of game time.