this game runs on the source engine(the same that powers l4d). the graphics, however i feel is not up to par for the powerful and efficient source engine. the textures of this game dosnt seem to match to counter strike source which is awkward as both uses the same engine, as such, i feel that the game doesnt and did not reach its full potential.
that game uses the in game currency of crones which for a general knowledge is a world war 2 currency. variety wise, the game has a somewhat decent variety of guns but it is still tiny compared to wolfteam, combat arms, and crossfire. character customisation is also not very good, with limited weapon customisations or up to no customisation.
like most standard fps game, kos has the standard modes of team death match and search and destroy but it is really lacking in other game modes which other games has such as search and destroy infinity in blackshot, mutation or hero in crossfire of team flag match in blackshot and combat arms. overall, kos secret operation is a good game that can be played when you are bored but i do not reccomend it as your main fps game.