[MangaD]

Without referral codes, you can earn 70% of all heroes. With referral codes you can:

• Earn a 3-star hero by inserting someone's referral code (only once);
  
• Earn a 3-star hero when someone who inserted your code finishes Act 1;
  
• Earn a 4-star hero when someone who inserted your code finishes Act 3;
  
• Earn a 5-star hero when someone who inserted your code finishes Act 5.
  

Yes, you can get all heroes.

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If you are going to ask multiple questions I suggest you put them all in the same thread for better organization.

Multiplayer is unlikely to happen with Hero Fighter X, I wouldn't expect it any soon. It is impossible, however, to tell you if it is going to happen or not, as not even Marti knows yet. And, if it happens, it is unlikely that will be through WI-fi, most likely Bluetooth, meaning you can play only with close friends.