CRACK THE CODE · GRADE 6
The Cipher of the Hakone Puzzle Box
Solve the algebraic equations represented by traditional Japanese symbols to determine the four-digit combination that opens the secret compartment.
Each shape stands for a number. Work out the missing ones first, then solve the shape equations and read off the 4-digit code. Do it here or print the sheet — the answer key comes with it.
The key
Every symbol is a whole number from 1 to 20. A number in front of a shape means multiply: 2 stars = 2 x star. A small 2 after a shape means square it: star^2 = star x star.
Find the missing values
Some shapes in the key are missing. Use these equations to work them out, then write them into the key. Take them in order.
Crack these
- 1.2+=
- 2.3=CODE 1
- 3.(−)×(+)=
- 4.2+2=CODE 2
- 5.×−2=
- 6.2+2=CODE 3
- 7.2×(+)−=
- 8.×−2=CODE 4
- 9.2+=
- 10.3−2+=
The vault code
Take the ones digit of your answers to problems 2, 4, 6, 8 (the ones tagged CODE 1–4), in that order. That opens the locked lacquerware himitsu-bako.
Show answer key (for grown-ups)
Key: lightning bolt = 11 (hidden) · square = 12 (hidden) · star = 6 · pentagon = 5 · moon = 16 (hidden) · heart = 10 (hidden)
Every symbol is a whole number from 1 to 20.
Vault code: 8746