The 2025 title
The Junior Mental Calculation World Championship ran from 4 to 6 October 2025 in Bielefeld, Germany, organised by Caroline Merkel, with roughly 80 competitors from 15 countries. Egypt, Panama and Turkmenistan entered for the first time.
In the under-12 category, listed as Junior 1, Douidi finished first with 2,416 points. Her compatriot Mohamed Iyed M'Ghozzi took second on 2,361 and Mihika Samir Bole of India third on 2,279. Fifty-five points separated the top two, in a scoring system where the leaders finish within a few per cent of each other.
The year before: second by 49 points
The 2024 championship, also in Bielefeld and held from 21 to 23 September, drew 84 competitors from fourteen countries. The under-12 result that year reversed the 2025 order: M'Ghozzi first on 2,225 points, Douidi second on 2,176 and Niva Vishal Gada of India third on 2,049.
Forty-nine points is a narrow defeat at this level. What the two tables show together is not a single good morning but a year of improvement, with the winner's score rising by 191 points and the gap flipping from a deficit to a lead.
What the championship actually asks
The championship is a two-hour written paper rather than a stage event. Competitors work through disciplines that the reports list as addition, square-root calculation and day-of-week determination, with three age categories: under-12, under-15 and under-20.
Workshops led by mental calculation experts run before the competition, which makes the event as much a meeting of the discipline as a contest. Scores are cumulative across the paper, which is why totals appear in the thousands rather than as counts of correct answers.
What is documented - and what is not
Everything above comes from two published results reports. They give a name, a country, a category, a score and a placing. They give no birth year, no age beyond the category limit, no school, no home city and no photograph.
That restraint is deliberate here. The competitor was in an under-12 field in 2025, and Geniuses.club publishes nothing about a child that the press and the organisers have not already published themselves. Her name also appears in the 2024 report as Douidi Wissal Firdaousse, a different ordering of the same name.
Algeria on the junior circuit
The under-12 podium in both years was shaped by Algeria. In 2024 the country took the top two places, and in 2025 it took them again in the opposite order, with an Indian competitor third on both occasions.
The junior championship draws from a widening map. The 2025 entry list included Algeria, Bulgaria, the Czech Republic, Egypt, Germany, Hungary, India, Japan, Mexico, Panama, Qatar, Serbia, South Africa, Turkmenistan and the UAE, three of them entering for the first time. A world title won inside that field is a result against the strongest young calculators competing anywhere, and it was won by a margin that the scoreboard puts beyond argument.
| Person | Country | Milestone | Age / Stat |
|---|---|---|---|
| Wenzel Grüß | Germany | Most Versatile Calculator, 2018 Mental Calculation World Cup | Age 9 |
| Andrej Živanović | Serbia | Junior Mental Calculation World Championship titles | Age 11 |
| Marc Jornet Sanz | Spain | Second place at the 2010 and 2014 Mental Calculation World Cups | Age 16 |
| Freddis Reyes Hernández | Cuba | Winning multiplication and the Memoriad Trophy at the 2012 Mental… | Age 27 |
| Wissal Firdaousse Douidi | Algeria | Under-12 Junior Mental Calculation World Champion, 2025 | — |
What is documented — and what is not
✓ Documented
- First place, under-12, with 2,416 points at the 2025 Junior Mental Calculation World Championship (World Mental Calculation)
- Second place, under-12, with 2,176 points at the 2024 edition
- Both editions held in Bielefeld, Germany, with roughly 80 and 84 competitors respectively
? Unverified, disputed or wrong
- No published birth year, exact age, school or home city
- No Wikipedia article, interview or press profile found
- No information about results before 2024 or after 2025
Questions people ask about Wissal Firdaousse Douidi
What is Wissal Firdaousse Douidi known for?
Winning the under-12 category of the Junior Mental Calculation World Championship in 2025, a year after taking second place in the same category.
How old is Wissal Firdaousse Douidi?
No source used here gives an age or birth year. She competed in the under-12 category in 2025, which is the only age information published.
What score won the title?
2,416 points, ahead of 2,361 for Mohamed Iyed M'Ghozzi of Algeria and 2,279 for Mihika Samir Bole of India.
Where is the championship held?
Both the 2024 and 2025 editions were held in Bielefeld, Germany. The 2025 edition ran from 4 to 6 October and was organised by Caroline Merkel.
What does the competition involve?
A two-hour paper across three age categories, with disciplines the reports list as addition, square roots and day-of-week calculation.
Is Wissal Firdaousse Douidi on Wikipedia?
No Wikipedia article was found. The record here rests on the championship's published results.
Why is her name written in different orders?
The 2024 report lists her as Douidi Wissal Firdaousse and the 2025 report as Wissal Firdaousse Douidi. It is the same competitor.
What happens next?
The 2025 report states that she moves up to the under-15 category, Junior 2, for the following year. No result after 2025 appears in the sources used here.
Quick quiz: how well do you know Wissal’s story?
Which title did Wissal Firdaousse Douidi win in 2025?
Where was the championship held?
How did she finish in 2024?
Sources
- Junior Mental Calculation World Championship 2025: Results — World Mental Calculation, 2025-10-15
- Junior Mental Calculation World Championship 2024: Results — World Mental Calculation, 2024-09-29
Checked by the Geniuses.club editorial team. Ages are given as of September 2026.
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