GATING

Blocking access to parts of a location, or confining the player to a small room or area, until a specific set of requirements are met. Gating can involve a physical task, such as unlocking a door, require players to return at a set time, or require a certain skill or piece of equipment be acquired.

“It’s technically an open world, but calculated, frequent use gating keeps players from exploring beyond what Metroid Prime considers appropriate for narrative progression.”