Altbet is new masternode coin. Presale ended 24/10/18, Cryptobridge listing at 26/10 and now we have platform already.
Altbet platform allows you to play few different games like slots, roulette, penalty, coin flip or dice. You can register with your wallet address and deposit ABET to play for real money or you can play as a demo user to test it.
Platform is open, games are working but you should still wait with your deposits because of bug. Unfortunately platform can take all your funds "just like that". Of course devs are working on it and should fix it soon but if you want to risk, deposit only small amounts of ABET coins.
According to dev announcement that bug was fixed but when I was testing platform and deposit 10 ABET I was only able to play few times because my funds are missing.
When this disappearing coins bug will be fixed you will be able to play on very good platform that offers you few different games. For now do not deposit large or any amount of ABET coins to platform and wait for bug fix.