Spin & Gold - How to avail of Spin & Gold Challenge?

Sign-in, click the Spin & Gold button in the upper left corner of the lobby and opt-in. 

Set your time, keeping in mind that the longer you play, the bigger the prizes. Pick your preferred challenge, taking care to suit a mission which compliments your play style.

Gold is instantly issued upon completion of the challenge, but collected gold vanishes if you fail.