In the game of devouring, the key to the mental hospital is on the stool in the second room on the right side of the corridor. First, after entering the game, click the "single player" mode to enter the map selection interface.

Secondly, players can choose to enter the "mental hospital" map.

Third, after entering the map, players need to look for the key carefully. The specific location is to find the "key" to escape from danger in the second room on the right side of the corridor. Don't worry about finding it slowly during the game.