What Is Ooodle? (Three O's)

Ooodle is a daily puzzle from Maths Zone, a long-running free UK maths-games site for primary schools. Each day's equation frame hides five numbers; the equation's answer is shown, and you have six attempts to work out which numbers go where. Feedback comes per number — green for right place, yellow for in-the-equation-but-elsewhere, grey for not used — and every guess must actually equal the shown answer under order of operations.

It surfaced in the first weeks of 2022 (a teaching directory listed it in early January, which would make it one of the earliest maths-Wordles — we'll hedge the exact date), and it stayed what it was built to be: a classroom BIDMAS drill wearing a puzzle's clothes. A beefier sibling, OoodleMax, raises the difficulty. One caution for searchers: the name attracts clone sites, so the Maths Zone page is the one to bookmark.

Play it at mathszone.co.uk. Ooodle is its own game by its own makers — NerdleBuddy is not affiliated with it (or with Nerdle); this guide is our independent take.

Order of operations is the entire game: with the structure and answer fixed, a multiplication slot constrains its neighbours far more than an addition slot does, and testing the high-leverage positions first collapses the space fastest. Numbers are used at most once each, so a confirmed digit is also an elimination everywhere else.

It reads like Nerdle with the training wheels moved: easier because the frame and result are given, sneakier because every deduction routes through BIDMAS rather than tile colours alone. Teachers use it as a warm-up for exactly that reason — as does our own classroom guide.