Score
0
Time
180s
Best
—
Cross out numbers so every row and column adds up exactly to its target. Solve as many grids as you can before time runs out.
A grid is filled with numbers. Each row shows a target sum on its right; each column shows one along the bottom.
Tap a number to cross it out (✕) — a crossed-out number is removed from its row and column totals. The numbers you keep must add up to exactly the target on every row AND every column at the same time.
Tap a cell again to mark it as a definite keep (○) — a pencil aid that does not change the maths — and once more to clear it back to normal.
A target clue turns green the moment that line is exactly right, and red if you have crossed out too much (the remaining sum dropped below the target), so you can read your progress at a glance. Solve the whole grid and a new, usually larger one appears at once.
Grids grow from 3×3 toward 5×5 as your score climbs. Your score is the number of grids you finish before the clock hits zero.
Sumplete is really a removal puzzle, so flip the question around: for each line, work out the surplus — the current total of all its numbers minus the target — and look for numbers that add up to exactly that amount to cross out. A surplus of zero means the line is already done; leave it completely alone. A surplus equal to a single number on the line points straight at the cell to delete.
Small surpluses are your friends because they have so few combinations. A surplus of 1 can only be a 1; a surplus of 2 only a 2; a surplus of 3 is either a lone 3 or a 1 and a 2 together — and the crossing column usually tells you which. Hunt for lines with one or two obvious deletions first and commit them.
Then let rows and columns talk to each other. Crossing out a cell lowers both its row and its column at once, so a deletion forced by a row often finishes a column for free, and the reverse. Use the colour feedback as a live checklist: a clue that has gone red means you have removed too much and must restore a cell, while the lines still showing a plain number are the ones that still need work. The ○ keep-mark is worth using on numbers you have proven must stay, so you never cross them out by reflex when the grid gets busy.