[App] Bingomatic

This is my first app, i hope you like it. Feedback and suggestions are very welcome 'cause the first people who rated my app didn´t give me any clue of what was wrong. I´ve tested in different configurations in the emulator but not bugs encountered. Everything seems to work fine.
If you like it please vote it well, i really need to get rid of this low rate avg...

Description:
Bingomatic is an application to play bingo games with friends no matter where you are. You only need some paper to copy there the bingo cards that the app generates. Then start the game, bingomatic will call the numbers like a bingo caller machine. It can do it in several languages and you can configure the speed at wich the numbers will be called.

Screenshots & QR Code

I'm working on It, actually it's already done but i have no time today to test it well and publish it, so probably tomorrow i'll publish an update.

I've never played this kind of bingo that was the reason I didn't knew it. So thanks for telling me!

Thanks, I'm glad you liked it! About your suggestion, I just googled this games you tell me, and i know what you mean, but my question is, are those games frequently played, I mean, regular people know the different games for its names? it's because I'm thinking in case i implement this if it will be good to offer different games for its name just after select US bingo or just add an additional advanced preference where you select witch column will be called.

I think the second option is more flexible for the user and maybe it confuse less the regular players, probably I'll take this one.

Anyway i think its not hard to develop I'm gonna take a look now to the code. I don't have much time these days but if it not too hard I'll do it. Thanks for your feedback and ideas!

Greetings!