2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/145587This paper suggests a perfect-information game, along the lines of Levy's characterization of Brownian motion, that formalizes the process of Brownian motion in game-theoretic probability. This is perhaps the simplest situation where probability emerges in a non-stochastic environment.17 pagesProbability60G05; 60G44text