Logic ยท Chain Reaction

Black Hole Square

Tap pieces to move whole rows, follow each tile's rule, and leave nothing outside the black hole.

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Tactile puzzle tiles being pulled into a black hole

Playable game

Clean the universe

Twenty compact puzzles plus three bonus challenges, all included.

Play

Black Hole Square

Tap tiles to test their behavior. Swipe right to reset or go back; swipe left to advance.

Quick guide

How to play

Test each symbol

Different pieces push, pull, block, or transform the board.

Count your moves

Every puzzle gives you a tight move budget, so sequence matters.

Swipe to navigate

Swipe right to reset and left to continue when you are ready.

Adapted from Quinten/black-hole-square under the MIT License. All bonus puzzles are enabled in this edition.