Today's mentalfloss.com Brain Game Wednesday Wordplay challenge celebrates that age-old problem of keeping pens on, in, or even near a desk. They always seem to disappear, don't they? Good luck:

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

P E N S
_ _ _ _
_ _ _ _
_ _ _ _
_ _ _ _
D E S K

Here is a 5-step SOLUTION.

A 5-STEP SOLUTION:

P E N S
P E A S
P E A K
P E C K
D E C K
D E S K

Did you come up with a different sequence of words (shorter, longer, or the same length)? Please share it with us in the comments below. Thanks for playing!