WHAT ARE EXPERIENCE POINTS, EXP CASES, AND KEYS?
Keys are related to the leveling system. By opening cases and using other modes on the site, you earn experience points, which increase your level. The amount of exp received is visible in the contents of a specific case and in the summary after a completed battle. When you advance to a higher level, you receive keys that allow you to open a case every 6 hours. The higher your level, the more and better keys you will get. More information can be found on the page dedicated to the leveling system.