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Coding-Decoding - Intermediate-Advanced Level: cipher solving INTERMEDIATE-ADVANCED

Intensive strategic solving 🎯 drill: 20 intermediate-advanced-level coding-decoding questions. Worksheet 20 of 30 hones your cipher solving abilities. Practice cipher solving, encoding rules, decoding techniques under timed conditions. Best for advanced developing students seeking advanced concepts with increasing complexity.

📝 Worksheet 20 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Intermediate-advanced level

What you'll learn in this worksheet:
Your progress through Coding-Decoding
Worksheet 20 of 30 (66% complete)

Question 1

If 'CHAIR' is coded as 'RIAHC', then how is 'WALL' coded?
The pattern is reverse coding: CHAIR → RIAHC, so WALL → LLAW
reverse, pattern

Question 2

If 'VERIFICATION' is coded as '131' using the rule 'sum of the positions of all letters', then how is 'HIDDEN' coded?
Sum of positions: VERIFICATION → 131
arithmetic, operations

Question 3

If 'TEXT' is coded as 'RCVR' using the rule 'subtract 2 from each letter's position' (A=1, B=2, ..., Z=26, wrap around), then how is 'NETWORK' coded?
Each letter position -2: TEXT → RCVR
arithmetic, operations

Question 4

If 'CAT' is coded as 'DBU', then how is 'BOX' coded?
The pattern is shifting each letter by +1. So BOX becomes: B(2→3) → O(15→16) → X(24→25) = CPY
shift, basic

Question 5

If A=1, B=2, C=3... Z=26, then 'CODE' is coded as?
Converting each letter to its position number: C=3, O=15, D=4, E=5 → 31545
numbers, substitution

Question 6

If 'PAPER' is coded as 'REPAP', then how is 'CEILING' coded?
The pattern is reverse coding: PAPER → REPAP, so CEILING → GNILIEC
reverse, pattern

Question 7

If in a code, A↔Z, B↔Y, C↔X, etc. (each letter replaced by its opposite), then 'ALPHA' becomes 'ZOKSZ'. How is 'FAST' coded?
Opposite of FAST: FAST → UZHG
opposite, mirror

Question 8

If A=1, B=2, C=3... Z=26, then 'PYTHON' is coded as?
Converting each letter to its position number: P=16, Y=25, T=20, H=8, O=15, N=14 → 16252081514
numbers, substitution

Question 9

If in a code, A↔Z, B↔Y, C↔X, etc. (each letter replaced by its opposite), then 'AUTHENTIC' becomes 'ZFGSVMGRX'. How is 'PAGE' coded?
Opposite of PAGE: PAGE → KZTV
opposite, mirror

Question 10

If A=1, B=2, C=3... Z=26, then 'CODE' is coded as?
Converting each letter to its position number: C=3, O=15, D=4, E=5 → 31545
numbers, substitution

Question 11

If 'CAR' = 22 and 'KEY' = 41, then 'HAT' = ?
Sum of letter positions: CAR = 3+1+18 = 22, KEY = 11+5+25 = 41, HAT = 8+1+20 = 29
position, sum

Question 12

If 'CAR' is coded as 'FDU', then how is 'BOX' coded?
The pattern is shifting each letter by +3. So BOX becomes: B(2→5) → O(15→18) → X(24→1) = ERA
shift, basic

Question 13

If the code for 'FLOW' is 'UOLD' using the rule 'each letter replaced by its opposite (A↔Z, B↔Y)', then what is the original word for the code 'UOLD'?
To decode, apply opposite again: UOLD → FLOW
decode, reverse

Question 14

If the code for 'PIG' is 'KRT' using the rule 'each letter replaced by its opposite (A↔Z, B↔Y)', then what is the original word for the code 'KRT'?
To decode, apply opposite again: KRT → PIG
decode, reverse

Question 15

If 'MEMORY' is coded as 'HZHJMT' using the rule 'subtract 5 from each letter's position' (A=1, B=2, ..., Z=26, wrap around), then how is 'HIDDEN' coded?
Each letter position -5: MEMORY → HZHJMT
arithmetic, operations

Question 16

If 'SEVEN' is coded as 'VHYHQ' using the rule 'shift each letter by +1, then shift again by +2', what is the code?
Step 1: Shift +1 SEVEN → TFWFO, Step 2: Shift +2 → VHYHQ
mixed, complex

Question 17

In a certain code, each consonant is replaced by the previous letter (B→A, C→B, etc.). How is 'YELLOW' coded?
Consonants shifted backward: YELLOW → XEKKOV
conditional, vowels

Question 18

If 'CRYPTO' is coded as '97' using the rule 'sum of the positions of all letters', then how is 'FLOW' coded?
Sum of positions: CRYPTO → 97
arithmetic, operations

Question 19

If the code for 'HELL' is 'H2LL' using the rule 'vowels replaced by numbers (A=1,E=2,I=3,O=4,U=5)', then what is the original word for the code 'H2LL'?
To decode, replace numbers back to vowels: H2LL → HELL
decode, reverse

Question 20

If 'LETTER' is coded as 'XJNNJJ' using the rule 'multiply each letter's position by 2' (A=1, B=2, ..., Z=26, wrap around), then how is 'ANALOG' coded?
Each letter position ×2: LETTER → XJNNJJ
arithmetic, operations
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