mammut01: i think a badge indicating a rank up would interest me to invite friends.ones that shows rank..e.g.,1-5invites would give the lowest ranks.coz as i can see,things that can determine ones power and progress will make em pursue to be much stronger and aim to be better.

kenron347: I agree with aladin2 sir dreamer. But i think level 25 is too low. I suggest the invited player should at least reach level 35 or 40 before the credit is awarded to the player who invited.

vanish: Im not much in2 rewards but i do get excited when i win supporter . a free month would (possibly) interest me .

darkzoul: thank you so much sir shadow for the compliment. .

aladin2: forgot to mention..in 2nd case of invitations system, user never should have access to refferal link so he cant use it register himself again and again

aladin2: About reward: since credits are not available to buy from worlwide, it would be extremly helpful that the reward will be 1 credit for 1 new player. For avoiding cheating, yeah, alow only lvl 25+ users to be able to invite. Also, receiving the reward should be only the invited player reach level 25. (or he win supporter first time ). Now about invite method...there are so many ways...one would be referal link which everyone
could use it whenever he wants wherever he wants. Other way could be to send an email to all contacts from yahoo or gmail straight from bd. but the message and the link should be set by admin (that because
just sending a link in an email isnt attractive and many people will just do that) and this way cheating wont be available since user provides just email and admin provides text and link