on join:
    {levelExp::%player%} is not set
    set {levelExp::%player%} to 0
    
on death of player:
    attacker is a player
    add 10 to {levelExp::%attacker%}
    if mod({levelExp::%attacker%},100) = 0
    send "&7Otrzymałeś Poziom: &a%floor({levelExp::%attacker%}/100)%" to attacker
    
command /poziom [<text>]:
    trigger:
        send "&7-------[ &aPoziom &7]-------", "" to player
        send "  &7Posiadasz &a%{levelExp::%player%}% &8punktów doświadczenia!" to player
        send "  &7Twój Poziom: &a%floor({levelExp::%player%}/100)%" to player
        send "", "&7------------------------" to player