Note: I haven't played in a couple months. But assuming things haven't changed.
It doesn't cost SB to play
You answer 10 trivia questions.
If you get a question wrong, you have the option to rejoin ONCE to try for the jackpot, this costs SB (I never pay to rejoin)
Some questions, have bonus SB, if you get it right you earn 1-10SB
Stay until the end of the game to collect all the SB you earned.
I played when it started, but the hosts are so annoying that I don't play anymore, but I will play today because of the Swago square.
Mostly, you earn 5-10SB