Reachmahjong.com

As you can see, without the use of a league ticket in Janryumon, one can only play in the league five times in a 2 week span.

It seems that there are at least four different types of league tickets in Janryumon.
Green league tickets - http://shop.plaync.jp/goods/detail/494/ ... 8/index.nc
Red league tickets - http://shop.plaync.jp/goods/detail/494/ ... 7/index.nc
Yellow league tickets - http://shop.plaync.jp/goods/detail/494/ ... 6/index.nc
Purple league tickets - http://shop.plaync.jp/goods/detail/494/ ... 1/index.nc

The fifth type, blue league tickets aren't apparently sold currently for some reason.

I have small ideas of what each one does - that said, I still hold 3 green, 2 red and 2 blue league tickets - given to me as prizes from a previous Janryumon contest earlier this year or late last year.

I'd like to know how each league tickets is different, I currently have a blue one activated but it expires in like a week. 5 games only in 2 weeks seem a bit too little, since I'm only playing that right now so I don't lose my 6th dan rank if I lose. Do you know the requirements to rank up from D3, D2, D1 etc.? Because I played about 20 games now and still unranked.