game made on javascript so you can just edit it without RPG MZ Editor
in js\plugins\m\EventMenu.js edit
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if(set_energy>=ar_cost[vl]){
AudioManager.playSe({"name":"Up1","volume":40,"pitch":100,"pan":0});
set_energy-=ar_cost[vl];
if(vl==0){lvup_hp[set_chara]++;}
if(vl==1){lvup_mp[set_chara]++;}
if(vl==2){lvup_atk[set_chara]++;}
if(vl==3){lvup_mat[set_chara]++;}
if(vl==4){lvup_int[set_chara]++;}
if(vl==5){lvup_luk[set_chara]++;}
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just comment or delete string i.e.
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// set_energy-=ar_cost[vl];
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and lvlups not consume mana
in js\plugins\m\EventNormal.js edit
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if(ItemId==30){
if(EvName=="Etr1"){ds_inran[set_chara]++;}
if(EvName=="Etr1g"){ds_inran[set_chara]+=10;}
fun_json_put_tmp();
}else{
$gameParty.gainItem($dataItems[ItemId],ItemNum);
}
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just add multiplier to item that you pickup from the floor i.e.
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$gameParty.gainItem($dataItems[ItemId],ItemNum * 5);
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ps: sorry cant normally format code, in post edit it with all tabulations