Gamepop Tetris
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The paper cover integrates a custom matrix of 180 two-millimetre RGB LEDs, soldered onto a flexible circuit board with a thickness of just a tenth of a millimetre.
The circuit board is sandwiched between layers of paper, creating a bendable cover that measures roughly five millimetres at its thickest point, where the rechargeable coin-cell batteries are housed.
The game is controlled using seven touch sensors that are etched into the circuit board to replace physical buttons, and the falling tetrominoes appear as small cells of light that shine through the paper.