Best way to Rank up ?

make a new account for your imaginary friend both a you go in a room whit pass and kill him no mercy and in short time u will becom a high rank skilless players like more farmers in this game .rank mean nothing in crossfire if u r general or major or whatever u get no special sever for high rank players and u will play near to sergent players who use a skill named hak and humiliate u and ask u why u get such bad score if u r high rank .... so success for that

Exp Items duh ;D

Here's a better idea: Buy 15 computers, make 14 robots, buy n' attach all exp+ items, skip school for 3 years, and by the time you finish ranking up to Marshall, Saidin will announce the removal of this game.

Farm like a noob and u will rank up fast

;;

OMG, go buy 50% exp UP with 1700 zp for 7Days, then 10% with 1100 GP and 10% 750 gp.70%EXP UP AND U WILL PLAY SD AND MANY HOURS AND U WILL LEVEL UP EVERYDAY.ITS EASY AND FAIR

By playing TDM or ESC a lot

In my condition, i warm up daily on a TDM map or ESC Map.