Players have a limited time to apply various currencies to one of their items. The currencies are somewhat random but include high-level items such as chaos orbs and exalted orbs. The currencies are provided by the game and are not taken from the player's inventory or stash.
The experience can be simulated at https://poesimulator.github.io/trial/. In this simulation, players left-click to apply currencies, rather than picking items up with the left mouse button and applying them with the right, as they do in the real Tiny's Trial.