hi i want to do a game that people play against each other by btc the question is it call gambling ?
Yes. As long as there is money at stake, that's gambling.
Hmm I'm planning to develop few games such as backgammon let's say player1 put 0.01mbtc and player2 do the same and they play against each other.
That player vs. player game is a good idea and if it's backgammon, I think it's something. But most of the games that I've seen making this kind of pvp games except poker, they don't get much attention.
You think it's necessary to have gambling license ?
You've been answered by ryzaadit.