Just like the title asks - is there a Russian Roulette effect that allows the spectator to make all the choices? I'm not intending to add any real danger to it - no spikes or anything that will hurt anyone. Just the basic plot of: all of these items will be eliminated one by one until only one remains, and that's the one that was predicted / written down / has something surprising inside of it, etc.
I'm not adverse to using equivoque or something, but I'm curious if there's anything out there that allows the spectator to have a truly free choice? (Maybe some gimmicked props or something?)