Find the ghosts hiding on the board, using nothing but the numbers.
Nothing is left to luck. All 2,000 puzzles solve by reasoning, start to finish.
When you get stuck, a hint shows you why the next move is forced.

▍ The rules

A number in a cell counts the ghosts in the eight cells around it.
A number at the edge of a row or column counts the ghosts in that line.
Mark the cells you've ruled out with an ×.

Reveal a cell with no ghost in it and you lose one of three lives.
Lose all three and you start the puzzle over — on the spot, nothing else lost.

That's everything. The first puzzle teaches you as you play it,
so you can start without reading any of this.

▍ "Isn't this Minesweeper?"

The numbers read the same way. Very little else does.

· One wrong tap doesn't end the board (three lives, as above)
· Nothing is a coin flip. Every one of the 2,000 puzzles has been
checked to solve by reasoning alone, all the way to the end
· Rows and columns have totals too, so you can work the whole board

▍ You don't have to be a maths person

The 160 EASY puzzles are built entirely from moves where a single number
tells you the answer. Higher sets add new kinds of move: comparing two
numbers, then assuming a ghost is somewhere and finding the contradiction.
The boards grow, but that isn't where the difficulty comes from.

Every technique is written up in the Tips library,
one at a time, illustrated on a real board.

▍ The order you find them in changes your score

Line your moves up so several conditions complete at once, and the score jumps.
A puzzle that isn't hard to solve becomes something else when you go for full marks.

Finish one with no hints and no mistakes and you earn a crown.
Once you've solved a puzzle by pure deduction, a faint view of the answer lets you plan the perfect order next time.

▍ 2,000 puzzles, ten sets

EASY, NORMAL, HARD, EXPERT and MASTER — 1,110 puzzles — are free.
Past those are EXTREME (690) and ULTIMATE (200),
and the first several puzzles of each are free to try.

A small board takes a few minutes; a large one takes as long as you like.
Every puzzle is saved on its own, so you can go a little at a time.

▍ The ghosts

Keepy, Mimo, Zuzu, Piri and Tobi.
They chatter away beside you while you think.
Keep going and more of them show up, along with new wallpapers and sounds.

▍ Ads and money

**1,110 puzzles are free** — no time limit, no play limit on any of them.

There are ads: occasional ones between rounds, and a video when you ask
for a hint. You can buy them away.

**Everything is a one-time purchase. There is no subscription.**
· EXTREME (690 puzzles)
· ULTIMATE (200 puzzles)
· Remove ads

▍ Also

· Plays with no connection (only the ads need one)
· No timer. Nothing rushes you
· Progress backs itself up. Link a Google account and it follows you
to a new phone
· Available in 14 languages

Bit K.K.