GroupIt: Logic Puzzle

GroupIt is a calm logic puzzle of light and dark cells. Each board is a small argument you win one cell at a time, and each one has exactly one answer that you can reach by reasoning alone.

THE RULES

· Every cell is light or dark.
· A number counts the cells in its own patch: the cells of its tone joined to it up, down, left and right.
· Two patches of the same tone never share an edge. If they touched, they would be one patch.

That is the whole game. A 1 is a cell on its own. Two patches of three can never touch: together they would be one patch of six. From three small rules come boards that are quick to read and slow to finish.

ONE ANSWER, NO GUESSING

A solver checks every board before it reaches you: exactly one answer, and no lucky guess needed. No timer and no move limit. If you are stuck, you are stuck on something that can be worked out.

LEARN ON THE LADDER

Four ranks, each teaching one move a good solver uses. Practise it, then pass the rank's test, which you take without hints. Medium difficulty opens after rank 3, and Hard after rank 4.

PLAY YOUR WAY

Pick a mode, a size and a difficulty, and play. Classic is the plain game. Every other mode adds one twist: a margin that counts the light, a number that hides its colour, a third tone called gold, holes in the board, light patches that must be solid rectangles. Try a board of any mode before you unlock it.

TODAY'S BOARD AND THE ENDLESS SHELF

Pass the first rank and come back the next day: from then on a fresh board waits every day. When you want more, the endless shelf keeps dealing.

HINTS THAT EXPLAIN

Ask for a hint and the game finds the easiest cell you could work out from your own board, points at it, glows the clue that proves it, and tells you why in one line. It never places the mark for you. On the ladder's practice boards hints cost nothing and never run out. Elsewhere your first hint on each board costs nothing, and more cost gems.

A PERFECT RUN

Finish a board for the first time with no undo, no reset and no cell ever left on the wrong tone, and it pays an extra gem. Using a hint does not spoil it.

GEMS, AWARDS AND COLOUR

Boards you finish for the first time pay gems, and bigger, harder boards pay more. Gems unlock modes, extra hints and colour themes. Awards mark what you have done, and your records count the boards you solve: today, this week and all time.

MADE TO BE LEFT ALONE WITH

· Nothing stands in front of a board: no timers, no energy, no ad before a puzzle.
· Plays offline.
· No account and no sign-in.
· Share any board as a link. A friend without the game can play it in a browser.
· Colour themes for the board, and quiet music with a switch and a slider.
· A running count on each patch you mark, in distinct colours.
· A tap puts down one tone and a hold puts down the other. You choose which.

If you enjoy the quiet focus of a newspaper logic puzzle, you will feel at home.

Questions, ideas or a board that seems wrong? Write to zeroplusplusstudios@gmail.com or tap Contact us in Settings.