There is a chance when setting a bear trap or arming a land mine that you mess up and trigger it on yourself. This is done by checking to see if you would fail had you been untrapping it. If you would fail, then there is a 1/5 chance you trigger the trap on yourself.

On deeper levels, land mines cause a fiery explosion in addition to their existing effects. Player-placed land mines get a bit trickier; a simple implementation will just consider the depth of the level the trap is on, but a more correct one would track via a field on the land mine object (in case it is picked up and carried around to another level) whether or not it will produce an explosion when triggered.

Minesweeper implemented as a themed room: a certain fraction of spaces (probably 10% or less) have a land mine placed on them. Every space adjacent to a land mine bears an engraving of the number of adjacent mines; mines themselves are engraved with “X” or “BOOM”. Spaces with no mines adjacent have no engraving.

Armed bear traps and land mines can be teleported away if hit with a teleportation beam.

You can trigger land mines from a safe distance by hitting the square with a polearm.

Land mines should blast the player away in a random direction, not make them not move and fall into a pit.