Plinko
A ball drops through a pin grid into a multiplier slot.
You control two settings: the number of rows and the risk level. More rows deepen the grid and widen the spread of outcomes. Higher risk pushes value out of the centre slots and into the extremes, so the edge slots pay far more and the middle pays far less. Neither setting changes the house edge — they change the shape of the distribution. Low risk produces many small results around break-even; high risk produces long stretches of nothing punctuated by a large hit.