Qube

P to Pause and M to toggle sound.

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LEFT and RIGHT arrow keys (or A/D) to move around the field, DOWN key (or SPACE) to drop the cubes.

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Pop all of the required cubes to progress to the next difficulty level (of 12).

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Three cubes (or more) touching each other will pop, if you pop a bomb in that group it will take out either a horizontal or vertical line.

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(Try going through the ingame tutorial for more)