About quiz.3o9.in

quiz.3o9.in is a free puzzle site with two puzzle types:

Arithmetic (missing operator) puzzles -- an equation is shown with its operators removed; you work out which of +, -, ×, or ÷ belong in each blank so the equation is true, following standard order of operations.
Matchstick puzzles -- a false equation made of matchstick-style digits, solvable by moving or removing one or more sticks.

Every puzzle includes a full step-by-step solution, and puzzles are organized by difficulty so you can pick a level that suits you.

Who runs this

quiz.3o9.in is one of several independent tools and directories built under e309 -- see the full list below.

Get in touch

Questions, corrections, or feedback: quiz@3o9.in

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