What game was it? Did you try to google other user testimonials? You can typically find out which ones are scams by simply Googling.
It was a simple betting game where we have to just guess the next number will be greater than 5000 or not.
It was a game in this (freebitco.in) website... dont play it is just fake.
If you could verify your bets then that would make them legit. freebitco.in is a legit gambling site afaik to get an instant withdraw from them you need to have more balance than that because you have to pay for the miner's fee too. Here's their
main thread if you want to check them out