I dont understand the cheat engine and why change je for jg
but i have the file of backyardmonster called game15.swf, you can view the code base with swfdecoder.
Also i'm tried modify the packet header, when you make any change, a packet header is send to backyardserver, you can intecerpt the packet and change any value for example:
GET /p HTTP/1.1
Host: 0.21.channel.facebook.com
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; es-ES; rv:1.9.1.19) Gecko/20110420 Firefox/3.5.19 GTB6 (.NET CLR 3.5.30729)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: es-es,es;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Proxy-Connection: keep-alive
Referer:

Cookie: datr=YrkTTqke6fJ0SKOFjp9co26C; c_user=**********; L=2; lu=RgNIt5of5I2HRvf6BZVpa9gg; sct=1309915498; xs=68%3A1ef74b1a3d101b8947a1e218ac1fa30d; e=n; x-referer=http%3A%2F%2Fapps.facebook.com%2Fbackyardm onsters%2F%3Fref%3Dbookmarks%26count%3D0%23%2Fback yardmonsters%2F%3Fref%3Dbookmarks%26count%3D0; presence=EM309915628L21REp_5f654763376F4X309919139 094Y1309919069Z9G309915542PCC; act=1309919074995%2F3; wd=250x63
GET /api/v1/cf938c112909470baac12a1655e4d705/evt/?n=Piedrecitas&l=39&v=4002&st1=banking&s=654763376 &t=1309919994 HTTP/1.1
Host: api.geo.kontagent.net
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; es-ES; rv:1.9.1.19) Gecko/20110420 Firefox/3.5.19 GTB6 (.NET CLR 3.5.30729)
Accept: image/png,image/*;q=0.8,*/*;q=0.5
Accept-Language: es-es,es;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Proxy-Connection: keep-alive
Referer:
look carefully and you can find values such as banking and small stones (pebbles)