A sequence like "3, 6, 9, ?, 15" appears, with one number replaced by a question mark. Tap the correct value from four options. Each correct answer makes the next sequence longer and the step larger. Wrong answers cost a life.
What it trains
Missing Number trains numerical reasoning and pattern recognition. To find the gap, you need to work out the underlying rule — an arithmetic progression, a doubling sequence, and so on. This is the same reasoning used in math, coding, and any task that requires spotting regularities.
Tips to improve your score
Start with the difference between the first two numbers.
If the difference is constant, it's an arithmetic progression. If it doubles, it's geometric.
Check from the end: the answer should also fit the same rule with the last number.
Frequently asked questions
Is it free?
Yes, no registration required.
What kind of sequences are used?
Arithmetic progressions (adding the same number each step) with various step sizes.