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.. You think it's necessary to have gambling license ?
If it's a format like this then you definitely need a gambling casino license. Still there are a lot of questions still to be asked and based on that you can change its format to not need the gambling license. A simple example would be changing it into a tournament type of format where there's a type of registration fee and the top 3 winners would receive a certain amount of that price pool or you can set the price all on your own, simple as that. Another simple format would be kind of like those in the arcades where you exchange reward tickets for prizes. This is considering you'd expand your current list of games and not just backgammon, but anything else than that that involves putting out money is probably in the lines of gambling. Ask for some advice from those that are experienced tbh, or just in Reddit.