Risky Reward is a twist that featured in Survivor: New Zealand. It is a twist to Hidden Idols on Day 1, where in every castaway is given the opportunity to risk their tribe's safety to receive a shared idol, with the consequence of being an extra man down in the first two challenges. This risk is heightened by the fact no other idols are up for grabs in the season.
This twist gave every castaway the opportunity to trade in their tribe's chance at immunity for a shared hidden immunity idol before the first challenge of the season. If two people from the same tribe decided to take an idol together, then one member of that tribe would haven be forced to sit out for two challenges. It's a choice between keeping the tribe safe, or risking that for your own gains. With no other idols up for grabs in the season, it's a risk a number of people decided to take.