3d6, need three of a kind "I have the first digit!"

and then do it again and again until you have all digits solved

there could be levels of difficulty - three, four, five, etc.

meanwhile, the others are holding off guards shooting at them

or 1d6, now 1d6 and match the first, then another 1d6 until all match

again, maybe three of a kind or four or even five

but that's surely too easy