A toggle-the-grid logic puzzle stacked into a tower, black out every cell, then climb to a bigger, harder board.
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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.
A free, original browser game on PlayPendium. No download, no install.
