When a player spawns into a level, many videogames expect you to go in a certain direction. In 2D games, this is generally to the right. In 3D games, this is in the direction your character starts out facing.
However, many games that involve collectables will occasionally throw you a curve. That is, if you go in the opposite direction, instead of a wall or an unmoving screen, you'll find a hidden [...] [tvtropes.org]