# "I can use computers, grandson!"

My grandmother loves matchstick puzzles. Every time I visit, she shows me a brand new set for me to solve. I visited her recently for her birthday, and I was excited to receive a puzzle in exchange for my gifts. I opened the envelope and three sheets of paper fell out.

# 3

LSSIEHHNOHOFLSHNNNOFNHIIELET


I did not understand, so I asked my grandmother for clarification.

"Grandma? What does this mean?"

"I learned how to use the computer! See, even the matchsticks look digital!"

"Come on, that's called pixel art. So what's the puzzle?"

"What's my favourite show?"

"Huh?"

"Look at where the tips of the matchsticks land!"

"Grandma, do you need a doctor?"

"No, why?"

I left her alone after that, but these pixel matchsticks look intimidating...

Hint 1:

Notice how is not a tag.

Hint 2:

Only what is in the blockquotes is important.

Hint 3:

The colour and direction of the matchsticks do not matter.

• two of the blue colors are really close to each other, is there any way to make them more distingushable? I have a hard time see which is which xD Jul 17 '18 at 17:32
• @LioraHaydont They look pretty different to me, maybe adjust your monitor settings? Jul 19 '18 at 16:53
• I mean like blue and indigo, I tried on 3 different screens. The issue is not when they are next to each others, but in the 2nd "paper" they are far from each other sometimes so I never know which of the 2 is here Jul 19 '18 at 17:25
• @LioraHaydont I can see that now. Sorry about that, jafe's answer has all the coordinates, so you can use that as a reference. Jul 19 '18 at 17:37
• @Zimonze I don't think the yellow-orange match should be there. It should end in rot13:-rf not in -rgf Jul 20 '18 at 9:21

Line up clues 2 and 3, and we have 28 colour pairs corresponding to 28 letters.
- (orange, magenta) = L
- (red, indigo) = S
- (cyan, magenta) = S
- (dark green, indigo) = I
- (indigo, indigo) = E
- (magenta, blue) = H
- (orange, indigo) = H
- (blue, magenta) = N
- (blue, indigo) = O
- (indigo, light green) = H
- (orange, red) = O
- (yellow, light green) = F
- (light green, orange) = L
- (light green, yellow) = S
- (red, red) = H
- (magenta, red) = N
- (orange, dark green) = N
- (dark green, orange) = N
- (dark green, blue) = O
- (magenta, dark green) = F
- (cyan, blue) = N
- (dark green, cyan) = H
- (yellow, blue) = I
- (cyan, dark green) = I
- (yellow, cyan) = E
- (blue, blue) = L
- (red, blue) = E
- (yellow, orange) = T
Since the first image has colours in its X and Y axis, we can use the colour pairs as coordinates and insert the letters into the image in their correct place.

@PL457 figured out that this is a sudoku puzzle. Solving for all letters: