A minimod for GZDoom with a grappling hook. Feel free to use or modify.
Type give GrapplingHook in the console, then press User 3 to fire it. Hitting a monster will drag the monster to you, hitting a wall will drag you to the wall.
User 3 is not bound by default, see GZDoom options.
Agent_Ash aka Jekyll Grim Payne - code
Team17 - sounds