Creep Doku: a free picture logic puzzle with twikoi's drawings

What is Creep Doku?

Creep Doku is a free picture logic puzzle made with twikoi's drawings. The rule is simple: every row, every column and every box (the squares inside the thick lines) holds each picture exactly once.

There are no numbers to add up: just her drawings, each on its own soft colour so you can tell them apart at a glance. Tiny 4x4 grids are all pictures and great for kids; the 6x6 and the big 9x9 (easy, medium and hard) are for everyone.

Every puzzle is checked before you see it: it has exactly one answer, and a solver that thinks like a person reaches it without guessing. Solve one and a guest creature jumps out from behind the grid.

How to play

Tap an empty square, then tap a picture in the tray below the grid. Tap the same picture again to take it out.
One of each: a picture may appear only once in each row, each column and each box.
Notes (✎) let you jot small pictures in a square while you think. ✎+ fills in every note for you, and placing a picture rubs out the notes it rules out.
Check (top right) shows a wrong picture in red the moment you place it. Turn it off to play with no help.
Stuck? The hint lights up where to look and explains why, then Show me places the picture. Undo takes back your last move.
On a computer: click a square and press 1-9, arrow keys to move, N for notes, Backspace to erase, Z to undo, H for a hint.

Features

Five levels: Tiny 4x4 (all pictures, for kids), Small 6x6, and Big 9x9 in easy, medium and hard, with new puzzles every time.
Every puzzle has exactly one answer, proven by an answer counter and solvable by thinking alone.
Hints that teach: they show the row, column or box to look at, draw lines to the pictures that block the other squares, and explain the trick in plain words.
A lesson you play, not read: four guided moves on a little 4x4, then you finish it yourself.
Picture sets: twelve sets of her drawings (little things and creatures) that open with stars, each measured so every picture looks different.
A guest creature behind every puzzle (85 to meet), a picture page every 4 puzzles, three stars for no hints and no mistakes.
Two daily puzzles (a 6x6 and a 9x9) that are the same for everyone, with a result to share and a days-in-a-row count.

Modes, levels and unlocks

Puzzles: Tiny 4x4, Small 6x6 and Big 9x9 easy are open from the start. Medium opens after 2 easy puzzles, Hard after 3 medium.
Daily puzzles: A 6x6 mini and a 9x9 every day, the same for everyone. The 9x9 is easy early in the week and hard at the weekend.
Lesson: A little 4x4 that teaches rows, columns, boxes and the 'only one fits' idea, one move at a time.

Tips

Look for a box, row or column with only one empty square: the missing picture goes there.
Pick one picture and look for where it can still go in each box: often there is only one spot.
When a square sees all the other pictures in its row, column and box, only one is left for it.
On big grids, ✎+ fills in every note. Then look for a square with a single note.
If two squares in a row can only hold the same two pictures, no other square in that row can hold them.

Who will like Creep Doku?

Creep Doku is for anyone who likes a calm logic puzzle, from kids taking their first steps on a 4x4 of pictures to grown-ups who want a hard 9x9.

It is also for fans of twikoi's art: her little drawings are the pieces, and her creatures wait behind every grid.

Questions

Is Creep Doku free?

Yes. Creep Doku is free to play in your web browser. No sign-up and no ads.

Does it work on phones?

Yes. It is made for phones first: big squares, a picture tray that never covers the grid, notes, undo and hints. It works with a mouse and keyboard too.

Does it save my progress?

Yes. Your solved puzzles, stars, picture sets, guests and streaks save in this browser on your device, and a puzzle you leave halfway can be continued from the title screen.

▶ Play Creep Doku