Why won't my game save after I have created a memory card slot?

Create your account in @gmail.com/google account then use your phone number to verify your account (code) and then type your code. Then it should be done.

Saving and earning achievements is usually disabled in games when cheats are entered, because cheats can obviously be used to give you an unfair advantage.

No. Sometimes the best strategy may be to hold the higher card for later. However, remember that you have to follow the suit played.

You need to make a server of your own or have him make his own server. Then you can call and ask him to join his server.

The origin of red light, green light is unknown, but it has been played for generations.

You must delete the old game's save file before you will be allowed to save on a new file. To do this, go to the title screen, then press up,...

You can't save over auto saves. You have to create a separate manual.