You can keep your balance while walking on a tightrope, a narrow beam, a slippery ledge, or an uneven floor.
Check
You can walk on a precarious surface. A successful check lets you move at half your speed along the surface for 1 round. A failure by 4 or less means you can�t move for 1 round. A failure by 5 or more means you fall. The difficulty varies with the surface, as follows:
Narrow Surface
Balance DC 1
Difficult Surface
Balance DC 1
7-12 inches wide
10
Uneven flagstone
10 2
2�6 inches wide
15
Hewn stone floor
10 2
Less than 2 inches wide
20
Sloped or angled floor
10 2
1 Add modifiers from Narrow Surface Modifiers, below, as appropriate. 2 Only if running or charging. Failure by 4 or less means the character can�t run or charge, but may otherwise act normally.