Plinko is the board from The Price Is Right: a triangular field of pegs with prize slots along the bottom. You drop a disc from the top and it bounces its way down, deflecting off peg after peg, and where it lands is where it lands.
It's pure chance dressed as a decision — you choose the drop position, and that's the only control you have. The physics of the bounce do everything else, which is exactly why watching it is satisfying.
Almost entirely chance. You choose the drop position, but the pegs randomise the path so thoroughly that the outcome is effectively random — which is what makes it watchable.
The American game show The Price Is Right, where it debuted in 1983 and became the show's most famous pricing game.
Not here — this is a free browser version played for points, with no deposits or payouts.