In Big Order, the protagonist can do this, imposing his rules on any area he has previously walked on.

To get past his gameroom, they need to solve a series of puzzles, including sudoku.

Beelzebub: Chapter 135 introduces a character who can do this in his 'gameroom', causing all damage dished out inside to rebound on the attacker.

An already omnipotent being may be Even More Omnipotent in its home Domain. If the character's health is linked to that of the Pocket Dimension, they are a Fisher King. If the character has this power over dreams, it makes them a Dream Weaver. For large Pocket Dimensions, this may make the character a Dimension Lord. Compare Field Power Effect and Place of Power. Subtrope (and most extreme form) of Home Field Advantage. This is to give a character, possibly a protagonist, a challenge they CAN'T solve with their fists, since the first rule such a Domain Holder usually implements is 'Violence doesn't work here, sucker!' There seems to be trade-offs involved in this case, since often, one of the rules is that the Domain Holder is required to fully explain the Rules to his 'guests'. Those with this kind of power have their own little domain - a Pocket Dimension, a Mental World, a section of Cyber Space, or a ritually established area overlapping the normal world - where they have editing rights over the laws of reality.

Scp 106 pocket dimension plane