Decrypted code level 1:

var _0x679c=["\x6E\x6F\x43\x6F\x6E\x66\x6C\x69\x63\x74","\x2F\x61\x72\x63\x61\x64\x65","\x73\x70\x6C\x69\x74","\x68\x72\x65\x66","\x6C\x6F\x63\x61\x74\x69\x6F\x6E","\x2F\x61\x72\x63\x61\x64\x65\x2F\x61\x72\x63\x61\x64\x65\x5F\x73\x63\x6F\x72\x65\x2E\x70\x68\x70\x3F\x61\x63\x74\x69\x6F\x6E\x3D\x61\x72\x63\x61\x64\x65\x26\x73\x63\x6F\x72\x65\x70\x72\x65\x70\x3D\x70\x72\x65\x70\x61\x73\x63\x6F\x72\x65","\x3D","\x26","\x3B\x6A\x61\x76\x61\x73\x63\x72\x69\x70\x74\x3B\x30\x3B","\x3B\x31\x3B","\x2F\x61\x72\x63\x61\x64\x65\x2F\x61\x72\x63\x61\x64\x65\x5F\x73\x63\x6F\x72\x65\x2E\x70\x68\x70\x3F\x61\x63\x74\x3D\x41\x72\x63\x61\x64\x65\x26\x64\x6F\x3D\x6E\x65\x77\x73\x63\x6F\x72\x65","\x74\x6F\x70","\x70\x6F\x73\x74","","\x6C\x65\x6E\x67\x74\x68","\x73\x75\x62\x73\x74\x72","\x63\x68\x61\x72\x43\x6F\x64\x65\x41\x74","\x66\x72\x6F\x6D\x43\x68\x61\x72\x43\x6F\x64\x65"];
function _02x564(_0x4513x2,_0x4513x3,_0x4513x4,_0x4513x5)
	{
	var _0x4513x6=_0x4513x2;
	var _0x4513x7=_0x4513x3;
	var _0x4513x8=jQuery[_0x679c[0]]();
	var _0x4513x9=null;
	var _0x4513xa=window[_0x679c[4]][_0x679c[3]][_0x679c[2]](_0x679c[1])[0];
	_0x4513x8[_0x679c[12]](_0x4513xa+_0x679c[5],function(_0x4513xb)
		{
		_0x4513x9=_0x4513xb[_0x679c[2]](_0x679c[7])[0][_0x679c[2]](_0x679c[6])[1];
		var _0x4513xc=parseInt(_0x4513x6)+parseInt(_0x4513x9);
		var _0x4513xd=encryptString(_0x4513x7+_0x679c[8]+_0x4513x6+_0x679c[9]+_0x4513xc.toString(),_0x4513x9);
		_0x4513x8[_0x679c[12]](_0x4513xa+_0x679c[10],
			{
			gsubmitscore:_0x4513xd
		}
		,function(_0x4513xb)
			{
			window[_0x679c[11]][_0x679c[4]][_0x679c[3]]=_0x4513xa+_0x4513xb
		}
		)
	}
	)
}
function encryptString(_0x4513xf,_0x4513x10)
	{
	gresult=_0x679c[13];
	i=0;
	j=0;
	while(i<_0x4513xf[_0x679c[14]])
		{
		if(j>=_0x4513x10[_0x679c[14]])
			{
			j=0
		};
		char=Number(_0x4513x10[_0x679c[15]](j,1))^_0x4513xf[_0x679c[16]](i);
		gresult=gresult+String[_0x679c[17]](char);
		i++;
		j++
	};
	return(gresult)
}

Decrypted code level 2:

var _0x679c=["noConflict","/arcade","split","href","location","/arcade/arcade_score.php?action=arcade&scoreprep=prepascore","=","&",";javascript;0;",";1;","/arcade/arcade_score.php?act=Arcade&do=newscore","top","post","","length","substr","charCodeAt","fromCharCode"];
function _02x564(_0x4513x2,_0x4513x3,_0x4513x4,_0x4513x5)
	{
	var _0x4513x6=_0x4513x2;
	var _0x4513x7=_0x4513x3;
	var _0x4513x8=jQuery[_0x679c[0]]();
	var _0x4513x9=null;
	var _0x4513xa=window[_0x679c[4]][_0x679c[3]][_0x679c[2]](_0x679c[1])[0];
	_0x4513x8[_0x679c[12]](_0x4513xa+_0x679c[5],function(_0x4513xb)
		{
		_0x4513x9=_0x4513xb[_0x679c[2]](_0x679c[7])[0][_0x679c[2]](_0x679c[6])[1];
		var _0x4513xc=parseInt(_0x4513x6)+parseInt(_0x4513x9);
		var _0x4513xd=encryptString(_0x4513x7+_0x679c[8]+_0x4513x6+_0x679c[9]+_0x4513xc.toString(),_0x4513x9);
		_0x4513x8[_0x679c[12]](_0x4513xa+_0x679c[10],
			{
			gsubmitscore:_0x4513xd
		}
		,function(_0x4513xb)
			{
			window[_0x679c[11]][_0x679c[4]][_0x679c[3]]=_0x4513xa+_0x4513xb
		}
		)
	}
	)
}
function encryptString(_0x4513xf,_0x4513x10)
	{
	gresult=_0x679c[13];
	i=0;
	j=0;
	while(i<_0x4513xf[_0x679c[14]])
		{
		if(j>=_0x4513x10[_0x679c[14]])
			{
			j=0
		};
		char=Number(_0x4513x10[_0x679c[15]](j,1))^_0x4513xf[_0x679c[16]](i);
		gresult=gresult+String[_0x679c[17]](char);
		i++;
		j++
	};
	return(gresult)
}

function _02x564(_0x4513x2,_0x4513x3,_0x4513x4,_0x4513x5)
	{
	var _0x4513x6=_0x4513x2;
	var _0x4513x7=_0x4513x3;
	var _0x4513x8=jQuery["noConflict"]();
	var _0x4513x9=null;
	var _0x4513xa=window["location"]["href"]["split"]("/arcade")[0];
	_0x4513x8["post"](_0x4513xa+"/arcade/arcade_score.php?action=arcade&scoreprep=prepascore",function(_0x4513xb)
		{
		_0x4513x9=_0x4513xb["split"]("&")[0]["split"]("=")[1];
		var _0x4513xc=parseInt(_0x4513x6)+parseInt(_0x4513x9);
		var _0x4513xd=encryptString(_0x4513x7+";javascript;0;"+_0x4513x6+";1;"+_0x4513xc.toString(),_0x4513x9);
		_0x4513x8["post"](_0x4513xa+"/arcade/arcade_score.php?act=Arcade&do=newscore",
			{
			gsubmitscore:_0x4513xd
		}
		,function(_0x4513xb)
			{
			window["top"]["location"]["href"]=_0x4513xa+_0x4513xb
		}
		)
	}
	)
}
function encryptString(_0x4513xf,_0x4513x10)
	{
	gresult="";
	i=0;
	j=0;
	while(i<_0x4513xf["length"])
		{
		if(j>=_0x4513x10["length"])
			{
			j=0
		};
		char=Number(_0x4513x10["substr"](j,1))^_0x4513xf["charCodeAt"](i);
		gresult=gresult+String["fromCharCode""](char);
		i++;
		j++
	};
	return(gresult)
}