It's Wednesday Wordplay at the mentalfloss.com Brain Game. Enjoy!

By changing one letter in each step to form English words, and leaving all other letters in their original positions, change BACK into PAIN in the fewest possible steps.

B A C K
_ _ _ _
_ _ _ _
_ _ _ _
_ _ _ _
_ _ _ _
P A I N

Here is one 6-step SOLUTION.

A SIX-STEP SOLUTION:

B A C K
B A L K
B A L L
M A L L
M A I L
P A I L
P A I N

Did you come up with a different sequence of words? Feel free to share it with us in the comments. (And if you're aching anywhere, feel better.)