Newbie here (long time player though) 
I have always been fascinated by puzzles and riddles. I am grateful to the number of them posted on the message boards and the links that are provided to give players some interesting challenges non-combat wise.
I do have a question regarding something like this though:
How do you as GMs handle solving riddles and/or puzzles?
What house rule(s) do you use to succeed in solving these challenges?
Is it a simple intelligence and/or wisdom role? Is it something more complex?
What XP rewards do you give the PCs for solving on the first, second, third, etc... try? (What XP rewards in general do you give?)
I had something like this:
A simple riddle-solving example:
25% riddle understood: DC-10
50% riddle understood: DC-15
75% riddle understood: DC-20
100% riddle understood: DC-25
That’s just for a simple riddle (like the four legs in the morning, two in the afternoon and 3 at night—answer: man). But for more complex riddles and puzzles (<b>especially puzzles!</b>) I was hoping to get what your group does to solve these challenges.
Thanks all!

I have always been fascinated by puzzles and riddles. I am grateful to the number of them posted on the message boards and the links that are provided to give players some interesting challenges non-combat wise.
I do have a question regarding something like this though:
How do you as GMs handle solving riddles and/or puzzles?
What house rule(s) do you use to succeed in solving these challenges?
Is it a simple intelligence and/or wisdom role? Is it something more complex?
What XP rewards do you give the PCs for solving on the first, second, third, etc... try? (What XP rewards in general do you give?)
I had something like this:
A simple riddle-solving example:
25% riddle understood: DC-10
50% riddle understood: DC-15
75% riddle understood: DC-20
100% riddle understood: DC-25
That’s just for a simple riddle (like the four legs in the morning, two in the afternoon and 3 at night—answer: man). But for more complex riddles and puzzles (<b>especially puzzles!</b>) I was hoping to get what your group does to solve these challenges.
Thanks all!