Underkeep Hollowgrave Tunnels: Cross the Pressure Plate Pits

Cross the Hollowgrave Tunnels pressure plate pit

Stop on the solid tile facing the gap. Pick up a loose stone from your inventory, then release it over the center of the dungeon view. If the stone lands on the pressure plate across the gap, the mechanism puts a grate over the pit. Check for that change before stepping forward.

Dr. Incompetent’s gameplay at 1:55:34 shows the opening in the wooden tunnel and the game’s throwing instruction. The Hollowgrave section of the 9Puz walkthrough documents the pressure plate and grate result.

Identify the obstacle before using an item

What you see	What to do
A tunnel gap with a pressure plate on the far side	Try the item throw and check for the grate.
An outdoor drop hidden by vegetation	Orient yourself with the automap after descending. The tunnel grate instructions apply to the visible plate mechanism.
A silver keyhole at a closed door	Follow the Silver Key route.
Statues and plates in the demo	Check the demo statue puzzle for its own reset instructions.

Wooden supports and an iron gate appear in the video scene. The useful match is the combination of a gap and the target beyond it. If your map and view show a different obstacle, identify it before spending items.

Throw from inventory

1. Open the inventory while facing the gap from solid ground.
2. Pick up a loose stone. Keep quest items for their intended use.
3. Move the held item over the center of the dungeon scene and release it there. The in-game tutorial shows this interaction. It does not ask for a bow attack.
4. Look at the gap again. The grate is the confirmation that you can cross this opening.

The creator reacts to a successful throw around 1:57:10. Use the earlier tutorial timestamp if the missing step is how to release the item. The two timestamps answer different questions.

If the gap stays open

Keep the party on the solid side. Check whether the item actually left the inventory and landed on the target. If it did not, return to the centered view and try another loose item. Confirm the plate and gap belong to the same obstacle before repeating the action.

A later room uses multiple pits. Check the next grate individually as you progress. Crossing one gap establishes that the current opening is covered. Look at each following opening before stepping onto it.

If you have already fallen, open the automap and locate the stairs or a known route back. Mark the place you were trying to reach so you can distinguish a return to the same pit from progress through a different passage.

What to check after crossing

Record the crossing on your map if you expect to return. If your next blocked route is the northwest silver lock, check the key name and its chest location in the Silver Key guide. The throw solves the gap in front of the party. The key solves a later door.

The throwing instruction is visible in the original gameplay. The crossing result is described in the November 9 walkthrough. If your build presents a different floor layout, record the version and room before applying the route. Keep a screenshot of the gap and where the object landed when asking for help.