The Mole (2001)

S2E4 The Fourth Betrayal

The contestants face a challenge that puts their memories to the test as they attempt to unlock a safe. They receive a confidential telegram with an essential clue that goes unnoticed. A hidden game examines their moral values, causing them to be divided into "dumb" and "smart" teams. Brain teasers determine if they deserve the esteemed "MENSA" label associated with the show. However, one player's decision to bend the rules results in a penalty that affects the entire group.