All tiles are used how they are supposed to. Most of the rules should be the same as the original ones, but below are some that my wife and I came up with. Feel free to make up other rules.
Stairs
You can do as you prefer.
- Standard: All stairs lead to the roof.
- Harder: Only the first one (should be marked) leads to the roof.
- Hardest: Only the last one (should be marked) leads to the roof.
Guards
You can play with 1, 2 (recommended) or 3 of them, all move in every turn. Mark them and their dice somehow to know which belongs to which (for example different colors).
They can have 2, 3, 4 moves (can have different amount per guard) or however many you wish.
A fun additional rule can be used, that if one guard intersects another, it loses a given number of steps or even all of them.
Generate guard movements on the Harka Castle Guards page.