Trading Intern

Four rounds of interview before final round.

First round has basic probability question, similar to easy/medium problems you may find on a site like quantguide.

Second round there are two sample games. One included rolling a die and developing a stopping criterion. They were both solvable and had a concrete answer.

Third and fourth rounds there was just one game, with no definite answer. The interviewer would add stipulations to the game and see how you might approach it. Note that all the games have +EV elements, even if they aren't apparent.