on mine of stone:
    add 1 to {donextlvl.%player%}
on mine of stone:
    if {ktorylvl1.%player%} is false:
        stop
    else:
        if {donextlvl.%player%} is 80:
            set {donextlvl.%player%} to 0
            set {poziom.%player%} to 1
            send "&b&lLEVEL &7: &eNastepny Poziom! &61&e!" to player
            set {nextlvlza.%player%} to "&8160"
    if {ktorylvl2.%player%} is false:
        stop
    else:
        if {donextlvl.%player%} is 160:
            set {donextlvl.%player%} to 0
            set {poziom.%player%} to 2
            send "&b&lLEVEL &7: &eNastepny Poziom! &62&e!" to player
            set {nextlvlza.%player%} to "&8320"
    if {ktorylvl3.%player%} is false:
        stop
    else:
        if {donextlvl.%player%} is 320:
            set {donextlvl.%player%} to 0
            set {poziom.%player%} to 3
            send "&b&lLEVEL &7: &eNastepny Poziom! &63&e!" to player
            set {nextlvlza.%player%} to "&8Koniec."
    

every 2 second:
    loop all players:
        if {ktorylvl1.%loop-player%} is true:
            if {donextlvl.%loop-player%} is smaller than 10:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■ ■ ■ ■ ■ ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 9:
                set {PapiLevel.%loop-player%} to "&8[&f■&7 ■ ■ ■ ■ ■ ■ ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 19:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■&7 ■ ■ ■ ■ ■ ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 29:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■&7 ■ ■ ■ ■ ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 49:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■ ■ ■&7 ■ ■ ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 59:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■ ■ ■ ■&7 ■ ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 69:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■ ■ ■ ■ ■&7 ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 89:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■ ■ ■ ■ ■ ■ ■&7 ■&8]"
            if {donextlvl.%loop-player%} is 100:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■&8]"
        if {ktorylvl2.%loop-player%} is true:
            if {donextlvl.%loop-player%} is smaller than 20:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■ ■ ■ ■ ■ ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 39:
                set {PapiLevel.%loop-player%} to "&8[&f■&7 ■ ■ ■ ■ ■ ■ ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 59:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■&7 ■ ■ ■ ■ ■ ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 79:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■&7 ■ ■ ■ ■ ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 99:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■ ■ ■&7 ■ ■ ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 119:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■ ■ ■ ■&7 ■ ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 125:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■ ■ ■ ■ ■&7 ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 149:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■ ■ ■ ■ ■ ■ ■&7 ■&8]"
            if {donextlvl.%loop-player%} is 160:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■&8]"
        if {ktorylvl3.%loop-player%} is true:
            if {donextlvl.%loop-player%} is smaller than 40:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■ ■ ■ ■ ■ ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 80:
                set {PapiLevel.%loop-player%} to "&8[&f■&7 ■ ■ ■ ■ ■ ■ ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 130:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■&7 ■ ■ ■ ■ ■ ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 160:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■&7 ■ ■ ■ ■ ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 200:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■ ■ ■&7 ■ ■ ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 225:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■ ■ ■ ■&7 ■ ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 240:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■ ■ ■ ■ ■&7 ■ ■ ■&8]"
            if {donextlvl.%loop-player%} is bigger than 280:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■ ■ ■ ■ ■ ■ ■&7 ■&8]"
            if {donextlvl.%loop-player%} is 320:
                set {PapiLevel.%loop-player%} to "&8[&f■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■&8]"

command /levelset [<player>] [<number>]:
    trigger:
        set {poziom.%arg-1%} to "%arg-2%"
        send "&b&lLEVEL &7: &eUstawiono Level Gracza &6%arg-1% &eNa: &6%arg-2%&e!" to player

every 1 second:
    loop all players:
        if {poziom.%loop-player%} is 1:
            set {ktorylvl1.%loop-player%} to true
            set {ktorylvl2.%loop-player%} to false
            set {ktorylvl3.%loop-player%} to false
        if {poziom.%loop-player%} is 2:
            set {ktorylvl1.%loop-player%} to false
            set {ktorylvl2.%loop-player%} to true
            set {ktorylvl3.%loop-player%} to false
        if {poziom.%loop-player%} is 3:
            set {ktorylvl1.%loop-player%} to false
            set {ktorylvl2.%loop-player%} to false
            set {ktorylvl3.%loop-player%} to true

Placeholdery:
 Level : %skript_poziom.{player}%
 Posiadany Exp : %skript_donextlvl.{player}%
 To Pokazuje Ten Level : %skript_papilevel.{player}%
 Do Nastepnego Poziomu : %skript_nextlvlza.{player}% 

Usun Wszystko Od "Placeholdery:" do tego zdania, aby nie bylo bledow.
 

every 1 second:
    loop all players:
        if {ktorylvl1.%loop-player%} is not set:
            set {ktorylvl1.%loop-player%} to true

#EDIT

on first join:
     set {ktorylvl1.%player%} to false
     set {ktorylvl2.%player%} to false
     set {ktorylvl3.%player%} to false