Finite Difference Method
Also called: PDE solver, Crank-Nicolson, explicit and implicit schemes
The finite difference method prices derivatives by solving the pricing PDE numerically on a grid of price and time. It is the fastest accurate route for low-dimensional problems with early exercise, and it produces the Greeks almost for free as grid derivatives. Explicit schemes are simple but conditionally unstable; Crank-Nicolson is the usual production choice. Beyond three or four state variables the grid explodes and Monte Carlo takes over.
Where this is taught
Definitions are the trailer. These free levels turn Finite Difference Method into something you play — one bite-size lesson, with worked examples, a quiz and XP.