Most of my wager on Plinko and RocketDice so for wager competition I play on Plinko while for the biggest win competition I play on RocketDice
We can play both at the same time just open a new tab and minimize your screen/window then let the auto spin run
check your computer every 5-10 minutes to make sure all games are active because sometimes the game error.
Yes it is possible to play multiple game in same time by opening new tap on your Pc of mobile phone. But if you go to play two games at the same time, you will not be able to make up your mind and you will always take the wrong decision that will lead you to losses. So in my opinion playing two games together is a wrong decision it can never be profitable