19 Keys, which lent its center-piece to The Cube, had a jackpot that rose slowly, reached its peak and then fell dramatically. (You could say that Divided has a grand prize that falls as well.)
I remembered that J.D. Roth as the Gingerbeard Man presided over nine caricatures arguing over which of them would win $1.5 million that ended up being in the $300k range, and that reminded me of
Cash Crash, where a team have to keep tens of thousands of Euros from touching the floor, and a new format from MTV:
Stranded with a Million Dollars, wherein a group can win the grand prize by surviving forty days, but everything has a cost. ("
A canvas tent for only $25,000? We'll take four!")