Today’s mentalfloss.com Brain Game Wednesday Wordplay challenge is a new Word Ladder puzzle. Enjoy!

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

S P A R K
_ _ _ _ _
_ _ _ _ _
_ _ _ _ _
_ _ _ _ _
P L U G S

Today’s mentalfloss.com Brain Game offers a new Tuesday Test Time challenge that’ll have you looking up (or thinking up, anyway). Hopefully, the air’s not too thin. Good luck!

Which U.S. state capital
lies at the highest elevation?

Have at it with a brand-new Monday Math Square to jump-start this week’s quintet of mentalfloss.com Brain Games. Good luck!

Place the digits 1 through 9 in the white blanks so that the mathematical equations work both across and down. Each digit 1 through 9 should appear only once in the main grid (the red square).

Good luck with today’s mentalfloss.com Brain Game Free-for-all Friday challenge:

What is the only U.S. state capital whose name
contains exactly 1.5 times as many letters
as its corresponding state?

“Pretty, wooden, thin…” Hey, I think I dated her some years ago. Anyway, the pattern behind today’s mentalfloss.com Brain Game Think Thursday isn’t too tough to figure out, but be sure of your answer. Good luck!

pretty, wooden, thin, ________.

Which word best completes the above sequence?

a) back
b) horse
c) pounder
d) fourth

Today’s Wednesday Wordplay challenge at the mentalfloss.com Brain Game is filled with commonly-misspelled words that begin with the letter “E.” Four are spelled correctly; one is not.

Just ONE of the five words in the following list is misspelled. Identify the culprit:

EMPEROR
EXISTENCE
ECSTACY
EMBARRASS
EXUBERANCE

The second day of the workweek brings with it a new mentalfloss.com Brain Game Tuesday Test Time challenge. Try it out!

What letter of the alphabet is
missing from the following list
(and what does the list represent)?

E, I, P, Q, R, T, U, W, Y

As has become the custom here at the mentalfloss.com Brain Game, we open the work week with a new Monday Math Square. Enjoy!

Place the digits 1 through 9 in the white blanks so that the mathematical equations work both across and down. Each digit 1 through 9 should appear only once in the main grid (the red square).

Good luck with today’s mentalfloss.com Brain Game Free-for-all Friday challenge:

Unscramble the letters in
HEARTWOOD WARPS
to make a two word phrase.

Students taking (or who have recently taken) geometry should find today’s mentalfloss.com Brain Game Think Thursday challenge easy. Most of the rest of us… not so much. Good luck!

An octahedron is a three-dimensional object
made up of eight triangular faces.

How many triangular faces make up a tetrahedron?