Vertices Mode

This editing mode allows you to edit the vertices in your map. You can insert new vertices that automatically split linedefs and deleting a vertex that only has two linedefs attached will reconnect the linedefs properly. You can drag the vertices to move them and snap them to the grid and geometry. Hold Shift and/or Control to disable snapping to the grid and geometry.

The vertices editing mode is one of the classic (2D) editing modes.

Default Controls

V Switches from any other classic editing mode to this mode.
Insert Inserts a new vertex at the mouse coordinates. When near a linedef, the linedef will be splitten with this vertex.
Delete Deletes the selected vertices. Note that this may also remove attached linedefs and break your sectors.
C Clears the selection.