Uploaded November 2011 | Updated September 2026, 1 hour ago

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K.O.S. Secret Operations (Sting Online in Japan and Korea), is a free-to-play 3D tactical FPS MMO. It is published by YNK Interactive (DontBlynk) and developed by the same company.

The first thing to do in K.O.S is to choose a character from a few guys and after that you start to collecting money, equipment, clothing, armor, levels and weapons. After player has unlocked a new level he/she can improve the character's special skills.

The game has a total of twelve playable 'characters' of which six must be unlocked:
1.707th Special Missions Unit
-- The premier counter-terrorism unit of the Republic of Korea. Bonus: three additional bullets with sniper rifles.

2.Green Beret
- The most elite fighting force of the United States and arguably the world. Bonus: 10% Increased grenade and knife damage. Increased knife range.

3.Military Police Special Service Company
-- They are an elite branch of the Chinese Ministry of National Defense. Bonus: three additional bullets with shotguns.

4.SAT
- The anti-terrorism branch of the Japanese military. Bonus: five additional bullets with rifles and pistols.

5.Vympel
-- An elite arm of the Russian Federation's military. Bonus: ten additional bullets with SMG/MG weapons and slight bonus to armor piercing.

6.Ministry of People's Armed Forces
-- A branch of the North Korean armed forces. Bonus: 10% bonus piercing damage with rifles.

wagering system:
- K.O.S. allows players to put their money where their mouth is when they smack talk other players, as the game has a built in system for placing bets on matches. Skilled players should be able to make a boatload of crones (the game's currency) simply by beating their opponents after making a wager.

Health bars:
- Health bars are actually displayed on top of team mates. Serious MMOFPS gamers will certainly appreciate this little feature, as it makes coordinating with teammates infinitely easier in both clan battles and regular games.

Interface:
- Interface is extremely detailed and sleek. The game's radar is perhaps the best-looking radar of any MMO shooter. MMOFPS fans will absolutely love this feature. So many FPS games these days use the generic circular radar in the corner of the screen that only vaguely displays the location of nearby team mates and enemies with confusing dots. The radar in K.O.S. is completely different, as it very clearly shows not only the location of your team mates but also the terrain in full color and labeling. Simply put, the radar rocks.

Source engine:
- The game is actually based off the 'Source' engine. that's the same engine that Valve's created and uses in Counter-Strike Source and Half Life 2. The menus in K.O.S. were almost identical to the menus in Half Life 2. The game is actually moderately popular overseas. Those looking for a good free alternative to Counter-Strike Source should look no further, as K.O.S. is based off the same engine.

Maps:
- Maps are well designed. The game's maps are extremely detailed, and each has countless hiding spots and numerous different corridors to explore which helps keep the game fresh. Another interesting part of the game's map design is that maps sometimes include birds or dogs that are designed to enhance the scenery, but unlike traditional "scenary" animals, these are the type that can be shot at and killed. This has no impact on gameplay, but it's still a nice touch of detail. It's clear that the game's developers put a lot of effort into map design.

Official site: kos.playrohan.com