In Blade Ball, Case Keys are a currency-like mechanic that allows players to unlock cosmetics without spending in-game currency. They are similar to the Keys in popular PvP shooters like CS:GO or PUBG. Players can use a Case Key to open a Crate without any cost in the games main lobby. There are two types of Crates in Blade Ball: Explosion Crate and Sword Skin Crate. Players can get the ball effect that will appear when they die with the Explosion Crate, and with the Sword Skin Crate, they can get a lot of cool sword skins.

To get Case Keys in Blade Ball, players need to keep an eye on their Playtime Awards in-game. They can view their Playtime Awards by interacting with the "Extra" tab with the gift box icon in the upper-left hand of the UI and selecting "Playtime Awards" from the dropdown list. Once they have played Blade Ball for 20 minutes, they can get two Case Keys. However, if they leave the game at any point during those 20 minutes, the timer will reset, and they cannot earn more than one until a day has passed.

Players can check the timer for unlocking Case Keys in Blade Ball through the menu by pressing the Extras button at the top of the screen and selecting Playtime Awards. Once they have a Case Key, they can use it at the Premium Swords Skins Crate or the Premium Explosion Crate. When they approach the Crate, a message reading "Open one for Free" will appear, and they can redeem their Case Key by holding E.

In summary, Case Keys in Blade Ball are a way for players to unlock cosmetics without spending in-game currency. They can be earned by playing the game for 20 minutes, and players can use them to open Crates for free.