LS-007

Find the next letter: O – T – X – C – G – ?

Rule: Alternate shifts: +5, +4, +5, +4, ... so next continues the pattern.

So the next letter is L.

• Picking the first pattern you see without checking it against all rows/columns.
• Ignoring the simplest rule (counts, rotations, alternations) and jumping to a complex story.
• Not testing your rule on the middle row/column (where many puzzles “break” bad rules).