If you prefer the more common method of making non-combat checks for OSR games, use the following optional rule with the OSR Edition of Dark Horrors & Hidden Places. 1. Determine the relevant attribute’s modifier.

	Score			Modifier
	3			-3
	4-5			-2
	6-8			-1
	9-12			0
	13-15			+1
	16-17			+2
	18+			+3

2. Determine a level of difficulty.

	Difficulty			Level
	Very Easy			5
	Easy			10
	Hard			15
	Very Hard			20

3. Add the modifier and any relevant bonuses to a 1d20 roll. If the result is equal to or greater than the difficulty level, the roll succeeds. Another option is to apply relevant attribute modifiers to combat rolls (such as for Strength and Dexterity).