4. [ZP] Ultimate LvL System (Best for Zombie Plague Servers)
Counter-Strike 1.6 OciXCrom's Rank System is widely considered the "gold standard" for level and XP plugins due to its optimization, ease of use, and flexibility. Top Recommended Plugins OciXCrom's Rank System [XP | Levels | Ranks] cs 1.6 level system plugin
For each player (by SteamID or unique authid): ease of use
: Many systems use a multiplication factor for level-up requirements (e.g., Level 1 requires 100 XP, Level 2 requires 200 XP, Level 3 requires 400 XP). Level 1 requires 100 XP