Crazy Maths Games is a free collection of 80 browser games and 14 topic guides for UK secondary school students, built by the independent studio Sticky Pig Studios. Each game is a short, repeatable practice session on a single topic — order of operations, fractions, index laws, standard form, Pythagoras, trigonometry, quadratics, differentiation — with randomised questions, so it plays differently every time. A wrong answer pauses the game and shows the method rather than only marking the attempt. Every page names its curriculum reference, and GCSE pages name the AQA, Edexcel and OCR specification points. There are no accounts, no adverts and no tracking of children.