100 questions published across 10 sections. Every question is written for this skill specifically — no universal or borrowed bank is substituted. Answers are checked on this device only, and the result is an educational practice band for that exercise, never a clinical, diagnostic, or IQ-style score.
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This bank has 10 themed sections and 100 questions in total, ordered so the earlier sections are the gentler ones. Sit a single section, or work through the whole bank in one go. Nothing here is timed — the minutes are only a guide.
1. Letter positions and number codes10 questions · about 6 min, untimed
2. Shifting letters forward and back10 questions · about 6 min, untimed
3. Reversal and mirror codes10 questions · about 6 min, untimed
4. Rearranged-letter codes10 questions · about 6 min, untimed
5. Working out the rule from an example10 questions · about 6 min, untimed
6. Coded language: matching words to meanings10 questions · about 6 min, untimed
7. Number and symbol substitutions10 questions · about 6 min, untimed
8. Conditional coding rules10 questions · about 6 min, untimed
9. Two-step codes10 questions · about 6 min, untimed
10. Breaking codes and advanced patterns10 questions · about 6 min, untimed
Section 1: Letter positions and number codes
Warm up with the most common code of all: each letter stands for its place in the alphabet, so A is 1 and Z is 26.
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