A grapnel that can be tied to a rope and thrown upward, allowing the player to climb to an adjacent map

[drpeterbatesuk (Dr Peter Bates)]

Here’s a slightly less reductionist worked-up example implementing the rope as a hidden door. Rather than swapping out both rope and grapnel when the two are tied together, it swaps out the grapnel and melds it into the rope, before swapping the rope out and revealing the hidden ‘rope-door’ when the rope (with grapnel) is successfully thrown.