Mr L's Projects

You are excited to be starting high school at LHS, but something is not quite right.

Many of your new teachers, including Mr L, Mr B and Mrs N, seem to be using a secret code to communicate with each other.

The other day, you saw a sign on the technology staffroom door that said:

904771 4190667371789041 5666419078'90 1171239778 446697 41711997719041! 904771 73444497 56664190 4671 114419707173 2390 231111 9052567141.

The next day, you noticed a sign on a locked door in the corridor that said:

1947239720527820 41902390524478.

One day, in computing class, you learn that early computers were invented to help break codes in World War 2. You get together a group of your friends and use this tool to try and break the code (old version here).


You realise that each two-digit number is a letter. You go off in search of clues. You find a few simple codes here and there. You paste them into the computer program and try to guess what they mean. (If you get stuck, you move on to other messages, and come back later!)

A label on Mr B's backpack:

5697 46

A label on Mr L's backpack:

5697 11

A label on Mrs N's bag:

569741 78

After a few days of nothing further, your luck suddenly turns for the better, and you find new clues all the time...

A note Mr L asks you to send to Mr B, who reads it and gives you some worksheets to take back:

4752,

5697 46, 192378 184466 41717873 5671 41445671 24449770414771719041? 52 41717156 9044 4671 23 127124 194401527141 4147449790.

5697 11.

A sticky note on a pile of worksheets Ms N was carrying home a few days ago.

56239770 24449770.

A sticky note on a pile of returned books in the library.

207190 4190667371789041 9044 016690 46231970 4478 41477111397141. 41233971 46239090719718.

A sticky note on top of a pile of worksheets from your computing class:

52 734478'90 47233971 90525671 9044 56239770 9047714171 24449770414771719041. 52'1111 69664190 20523971 71231947 41906673717890 23 14719744 446690 4412 907178.

More and more serious looking messages keep turning up... the teachers definitely seem up to something!

A printed piece of paper all teachers seemed to have with them in class:

23 9771565278737197 124497 231111 9071231947719741 - 5290 5241 39719718 525601449790237890 184466 734478'90 976678 446690 4412 717871972018 2390 237818 0144527890. 1947521173977178 24521111 207190 39719718 41664101521952446641 5212 184466 41904401 24449770527820 5278 904771 565273731171 4412 1911234141. 5212 184466 239771 114424 4478 717871972018, 41717873 23 41906673717890 9044 904771 441212521971 5256567173522390711118 124497 23414152419023781971.

A message from the principal sent to all teachers.

196697977178901118 446697 '41906673717890 12529078714141 01974420972356' 5241 24449770527820 017197127119901118. 904771 44669073444497 201856 713466520156717890 5241 20717871972390527820 907178 017197 19717890 4412 446697 7111711990975219529018 7871717341. 2471 239771 11444470527820 9044 52784190231111 56449771 5623194752787141 78711590 90719756.

And then something your were not expecting... (save this message for last)

A note sent home to your parents!

90520141 124497 9744464490 01239771789041:

  • 01977190717873 9044 712390 9047977171 5671231141 71231947 732318
  • 194723972071 18446697 462390907197527141 2447521171 18446697 70527341 239771 446690
  • 47527371 231111 1947239720527820 713466520156717890 467112449771 90477118 207190 47445671
  • 18446697 70527341 24521111 4671 41242301017173 2390 904771 717873 4412 904771 18712397

Did you manage to crack the code and find out what was happening in this fictional story? Show your teacher your work. It's totally safe, we promise :-)


If you are looking for something a little harder, you can try Codebook Challenge 3.