By changing one letter at a time to form different English words, and leaving all other letters in their original positions, convert FREE into WILL in seven (or fewer) steps. Good luck!

F R E E
_ _ _ _
_ _ _ _
_ _ _ _
_ _ _ _
_ _ _ _
W I L L

Here is a six-step SOLUTION.

A SIX-STEP SOLUTION:

FREE > FRET > FEET > FELT > WELT > WILT > WILL

Did you come up with a different series of words? Feel free to post your solution in the comments. Thanks!