Certain drawbridges are made of steel rather than wood, which means they cannot be destroyed by force bolts and will not explode.

The passtune can be played at any drawbridge in the game to open or close it, but only the Castle drawbridge gives feedback in the form of gears and tumblers. You have to learn the passtune there in order to feasibly use it at other places.

Change Fort Ludios’s door to a drawbridge, and add several more drawbridges leading into the throne room from all sides. When one drawbridge is opened or destroyed, all the others automatically open to let the monsters swarm out and attack.

After the Valley, have a guaranteed special level “The Gates of Hell”. This level design is very clear: “This is hell. These are the gates, and they are closed. You are not wanted here. Go away or perish.” The level is a large cavern, with a massive arc-like fortification across either the left or right side. The gates are implemented with both iron doors and a drawbridge across lava. There is quite a lot of lava, and a lot of demons inside and outside the fortification.

Gehennom level that is cavernous but with 1-3 defensive fortifications consisting of a slightly twisty undiggable wall with turrets or guardhouses staffed with demons, and lava moats with drawbridges. Stairs on opposite sides of the fortifications.

When a monster is crushed in a drawbridge, its inventory might be dropped instead of totally destroyed.

When you crush a monster who is carrying a wand with a drawbridge, the wand explodes.

Using a cursed tonal instrument makes the gears and tumblers in the castle drawbridge lie to you.