extensionPuzzle Game

FILL THE GAP

Find the missing number in the sequence

60.0
Q 1
Points 0
— Level 1
Ready?
Find the missing number
in each sequence
Best: —
leaderboard RANKS
help_center
How to Play
keyboard_arrow_down
1. A number sequence with one missing value is shown. Study the pattern carefully.
2. Identify the rule — arithmetic, geometric, alternating — and calculate the missing number.
3. Enter your answer and confirm before time runs out. Harder rounds use trickier rules.
lightbulb
Expert Tips
Check differences first: Most sequences are arithmetic or geometric — calculate gaps between consecutive numbers first.
Split odd/even: If the gap isn't constant, check alternating positions separately — two interleaved sequences is a common trick.
pattern Pattern Recognition
tag Number Sense
lightbulb Logic

Fill the Gap

Goal

A number sequence is shown with one value missing. Identify the pattern and enter the correct number.

Pattern Types

  • Arithmetic — add or subtract a fixed amount each step.
  • Geometric — multiply or divide each step.
  • Alternating — two interleaved sequences.
  • Combined — patterns that mix rules.

Tips

  • Look at the difference between consecutive numbers first.
  • If differences are not constant, look at the ratio between them.
  • Check your answer by applying the rule forward and backward.
Why this sharpens your mind

Numerical Reasoning

Spotting patterns in numbers exercises abstract thinking — a core component of fluid intelligence, the ability to reason through novel problems.

Working Memory

You must hold multiple values in mind simultaneously while computing a rule — directly stressing and strengthening working memory capacity.

Fluid Intelligence

Adapting to new pattern types without prior instruction is one of the best exercises for raw reasoning ability, independent of learned knowledge.