Breathing

Breathing (tentative) is a gameplay mechanic that was at one point considered for Resident Evil 7: Biohazard.

In Resident Evil VII Biohazard Making Of, Jun Takeuchi mentioned that there was going to be a zombie in the game that would react to the player's breathing. In order to get past them, a button would need to be held which would hold the breath of the character. There was a limit to how long the breath could be held which would be indicated by a gauge on-screen, if the player failed to get away from this enemy in time, they'd be found and grabbed by it.

Takeuchi mentioned that players would also hold their breath alongside the character, which made the game feel tiring. He thought that leaving that mechanic in would lead to hypoxia, and so it was ultimately cut.