Mad Add is a minimalist number puzzle with a deceptively simple premise: you are given a grid of positive and negative integers, and your job is to delete numbers so that every remaining row and column sums to exactly zero. Every deletion is permanent, and deleting the wrong numbers can make a solution impossible — so every click requires deliberate logical thinking.
The game is inspired by the Sumplete concept but takes it further with negative numbers, non-square grids at higher difficulties, and a scoring system that rewards precision. Solving the puzzle while deleting the minimum number of cells earns bonus points; leaving extra numbers on the board (when fewer deletions could also work) counts against your efficiency score.
At Beginner level, Mad Add presents small 5×5 grids with simple integer ranges and obvious solution paths. As difficulty increases through the 7 levels, grid sizes expand, integers grow larger, and the number of valid arrangements multiplying makes brute-force elimination unworkable. Expert players develop pattern recognition for common row-sum configurations, mentally grouping cells into candidate sums before committing to deletions.
Mad Add is one of the best puzzle games for building mental arithmetic speed. The combination of addition, the possibility of negative numbers, and the constraint satisfaction aspect exercises a specific kind of numerical thinking that transfers to everyday mental maths. Many players report measurably faster mental addition after a few weeks of daily play.
The daily challenge uses a seeded grid that is consistent across all players, with a time-based scoring system that rewards both speed and efficiency. Completing the daily three days in a row starts a streak, tracked in your personal stats. Share your solve with the challenge link to send friends the exact same grid — see who finds the most efficient solution.
From Beginner to Cyborg ☠ — seven difficulty levels grow with you. Change difficulty any time using the dropdown at the top of the page.
Play Mad Add free online — no download required, no sign-up needed. Mad Add is a browser-based Puzzle game you can play on any device, any time. Challenge yourself with 7 difficulty levels, compete on the daily leaderboard, and share your score to challenge friends directly.
The daily challenge resets every midnight — build your streak and beat your personal best. Every game is fully playable on desktop and mobile without any installs.