Umbra

A toggle-the-grid logic puzzle stacked into a tower — black out every cell, then climb to a bigger, harder board.

How to play

Each board starts with a scatter of lit cells. Tapping a cell flips it and its orthogonal neighbours between light and dark. Your goal is to plunge the entire grid into darkness. Clear a board and you ascend to a larger one, so the puzzles grow as you climb.

• Tapping a cell toggles that cell and the cells above, below, left and right of it.
• Solve the whole grid into darkness to advance up the tower.
• Higher floors mean bigger grids and longer solution chains.

Game modes

• Daily — a fixed climb seeded the same for everyone that day.
• Practice — endless seeded towers to train your pattern sense.

Controls

• Desktop: click a cell to toggle it and its neighbours.
• Phone & tablet: tap cells — fully touch playable.

Tips & strategy

• Work top to bottom: fix each row, then use the row below to clear what's left above.
• Toggling the same cell twice cancels out — order doesn't matter, only which cells you pick.
• On big grids, solve the top rows fully before worrying about the bottom edge.

About Umbra

Umbra is an original free browser game that turns the classic cell-toggling light puzzle into a tower climb, with each cleared grid unlocking a larger and more demanding board.

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