Math Crossword: Number Puzzle
Contains ads
Everyone
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About this game
Math Crossword is a crossword made of numbers. The grid has sums instead of
clues, and the digits you place have to make every one of them true at once.
Tap a tile in the tray, tap a square, and it goes there. Tap the square again to
take it back. Every row across and every column down has to come out right, and
because the two cross, a digit you place for a row is also part of a column.
That is the whole game, and it is why it is a puzzle rather than a worksheet.
EVERY BOARD HAS EXACTLY ONE ANSWER, AND WE COUNTED
All 421 boards in this app were checked twice before they shipped: once by the
solver the game reasons with, and once by a separate exhaustive counter that
shares no code with it. A board is kept only when both agree there is a single
way to fill it.
So there is never a moment where you are choosing between two answers that both
work. If your grid holds, it is THE grid.
NOTHING NEEDS A GUESS
A board is also only kept if it can be reasoned out, one forced square at a
time, from the numbers already printed. There is always a line somewhere with a
single gap left in it. Finding that line is the skill, and it is a skill that
grows: by the last chapter no row and no column is enough on its own, and you
have to read one against the other.
THE ARITHMETIC IS THE ARITHMETIC YOU LEARNED
Times and divide happen before plus and minus, left to right. Division is
exact, so 7 / 2 * 2 = 7 is accepted, because it is true on paper. A game that
told you that was wrong would be teaching you something false about numbers to
make its own bookkeeping easier.
Digits run from 1 to 9. There is no zero, so nothing is ever divided by it.
300 BOARDS, EIGHT CHAPTERS, AND A DIFFICULTY THAT MEANS SOMETHING
Plus and minus, Times and divide, Three across, Order matters, Rows and
columns, Four across, Long lines, and The deep end.
Every board was graded by playing it, not by counting its blanks. Chapter one
finishes itself if you read one line at a time. By The deep end a square can
sit with five possible digits until a column you have not looked at rules four
of them out. The curve is measured, and it is checked on every build.
A NEW BOARD EVERY DAY
The puzzle of the day is the same board for everybody, keyed on the date. Play
it and your run of days goes up. Miss one and you get one chance to carry the
run on, then solve today's board to keep it. There are 120 daily boards before
one comes round again.
HELP, ON YOUR TERMS
Three helps: reveal a cell, check the board, and open the next board. Each one
is offered on the boards where it would do something, and on those boards it is
never withheld: what you are holding has no say in what you are offered. Take
one by watching a short advert, or spend gems, which arrive free from the
daily gift and from the ten ranks. Every button that costs an advert says AD on
it before you press it, and declining one takes nothing away.
Coins are separate and buy colour: five themes for the board, from Paper to
Ink. Coins never buy help and gems never buy colour. Neither one buys the
other, and coins can never be bought with money.
Undo is free and uncapped. Start again is free. Nothing is ever taken away for
finishing a board without help.
ADVERTS, SAID PLAINLY
A short advert plays when you leave a board you have finished, never during
one, and never in your first few. There is a banner under the board. Everything
else is an advert you choose, marked AD. Remove ads takes the first two away and
leaves the ones you choose, because those are help you asked for.
NO NONSENSE
No timer. No lives. No way to lose a board.
No account, no sign up, no email.
Plays offline. The boards are in the app, not on a server.
Your progress stays on your device.
Whether you call it a math crossword, a number crossword or a cross sums
puzzle, this is the one where the answer is provably the only one.
Free. Good luck with The deep end.
clues, and the digits you place have to make every one of them true at once.
Tap a tile in the tray, tap a square, and it goes there. Tap the square again to
take it back. Every row across and every column down has to come out right, and
because the two cross, a digit you place for a row is also part of a column.
That is the whole game, and it is why it is a puzzle rather than a worksheet.
EVERY BOARD HAS EXACTLY ONE ANSWER, AND WE COUNTED
All 421 boards in this app were checked twice before they shipped: once by the
solver the game reasons with, and once by a separate exhaustive counter that
shares no code with it. A board is kept only when both agree there is a single
way to fill it.
So there is never a moment where you are choosing between two answers that both
work. If your grid holds, it is THE grid.
NOTHING NEEDS A GUESS
A board is also only kept if it can be reasoned out, one forced square at a
time, from the numbers already printed. There is always a line somewhere with a
single gap left in it. Finding that line is the skill, and it is a skill that
grows: by the last chapter no row and no column is enough on its own, and you
have to read one against the other.
THE ARITHMETIC IS THE ARITHMETIC YOU LEARNED
Times and divide happen before plus and minus, left to right. Division is
exact, so 7 / 2 * 2 = 7 is accepted, because it is true on paper. A game that
told you that was wrong would be teaching you something false about numbers to
make its own bookkeeping easier.
Digits run from 1 to 9. There is no zero, so nothing is ever divided by it.
300 BOARDS, EIGHT CHAPTERS, AND A DIFFICULTY THAT MEANS SOMETHING
Plus and minus, Times and divide, Three across, Order matters, Rows and
columns, Four across, Long lines, and The deep end.
Every board was graded by playing it, not by counting its blanks. Chapter one
finishes itself if you read one line at a time. By The deep end a square can
sit with five possible digits until a column you have not looked at rules four
of them out. The curve is measured, and it is checked on every build.
A NEW BOARD EVERY DAY
The puzzle of the day is the same board for everybody, keyed on the date. Play
it and your run of days goes up. Miss one and you get one chance to carry the
run on, then solve today's board to keep it. There are 120 daily boards before
one comes round again.
HELP, ON YOUR TERMS
Three helps: reveal a cell, check the board, and open the next board. Each one
is offered on the boards where it would do something, and on those boards it is
never withheld: what you are holding has no say in what you are offered. Take
one by watching a short advert, or spend gems, which arrive free from the
daily gift and from the ten ranks. Every button that costs an advert says AD on
it before you press it, and declining one takes nothing away.
Coins are separate and buy colour: five themes for the board, from Paper to
Ink. Coins never buy help and gems never buy colour. Neither one buys the
other, and coins can never be bought with money.
Undo is free and uncapped. Start again is free. Nothing is ever taken away for
finishing a board without help.
ADVERTS, SAID PLAINLY
A short advert plays when you leave a board you have finished, never during
one, and never in your first few. There is a banner under the board. Everything
else is an advert you choose, marked AD. Remove ads takes the first two away and
leaves the ones you choose, because those are help you asked for.
NO NONSENSE
No timer. No lives. No way to lose a board.
No account, no sign up, no email.
Plays offline. The boards are in the app, not on a server.
Your progress stays on your device.
Whether you call it a math crossword, a number crossword or a cross sums
puzzle, this is the one where the answer is provably the only one.
Free. Good luck with The deep end.
A math puzzle crossword. Fill the grid so every row and column adds up.
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
What’s new
First release.
App support
About the developer
MOHAMMED KHALIL ZAMAN
hello@codelessapi.io
14 Wadsworth Fold
HUDDERSFIELD
HD3 3NB
United Kingdom
