If you are building a game in a tool like Unreal Engine , "putting together" an out-of-bounds system is a deliberate design step to keep players focused.

: Advanced decorators use "item swapping" or "cancel placement" glitches to make items sink into the ground or float in mid-air, effectively placing them in "illegal" spatial coordinates. Creating the Boundaries (Game Development)

In physical sports, out of bounds is a strict binary defined by the field's geometry.

: Instead of an invisible wall, many developers use a "Return to Play Area" message with a timer. If the player doesn't return, the system triggers a respawn.