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Super-tiny! This begins to approach the lower limits of visual interpretability. It's still far more readable than any 3x3 pixel font I've yet seen, though.
Like Four on the Floor, this font uses every trick I have picked up as a pixel artist and font artist to make itself as readable as possible. I consider this one suitable for general reading (e.g. when making pixel art tutorials or depicting book texts in pixel games), but only just.
Original size: 3pt (use multiples of this value for pixel perfection)