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Tappzi is a fast, tactile mental math game for iOS and Android. Each level gives you a grid of number tiles and a goal — work out in your head which tiles to tap to reach it the quickest. Thirteen worlds, 130 levels and a new puzzle daily, free with no ads.

Tappzi is a fast, tactile mental math game for iOS and Android — a workout, not a memory test. Each level hands you a grid of number tiles and a goal; you work out in your head which tiles to tap to reach it, scored on speed and on how few taps you used. Thirteen worlds and 130 levels carry it from sums under twenty to boards that freeze, slide, and forbid the wrong kind of number. A Daily Challenge deals one board a day, the same for every player, with its own streak. It is free and stays free — no ads, no account, and nothing leaves your device.

Tappzi is a fast, tactile mental math game for iPhone, iPad and Android — phones and tablets alike — built by one person for players from about age six upward.

Each level hands you a grid of number tiles and a goal. You work out in your head which tiles to tap to land a running total exactly on it, scored on two things that deliberately do not conflict: how fast you finish, which drives your score, and how few taps you used, which earns stars and multiplies it. Every board is generated and then verified against a solver, so none is unsolvable.

Thirteen worlds and 130 levels teach one operation at a time across three number bands, then complicate it. Addition climbs to a hundred and meets tiles you can tap more than once; subtraction repeats the shape in reverse. The last worlds add mechanics on arithmetic already mastered: tiles that must not be tapped, tiles that freeze until an ember thaws them, and boards that will not hold still. The first five levels cannot be lost at all, and the safety net is announced when it lifts rather than discovered.

A Daily Challenge deals one board a day, the same board for every player, derived from the date with no server involved. It keeps its own streak, and it gets harder as the week goes on.

Tappzi is free, and the 130 levels and the Daily Challenge stay free. There are no ads, no subscription and no account. Levels added later will be a one-time unlock; nothing that ships today moves behind it. Nothing is transmitted anywhere either — your scores, stars and settings live on your device and nowhere else.