LJ65 (formerly Tetramino) was a fan-created homebrew game developed by Damian Yerrick for the NES.

The game offered a single, endless Marathon mode with four different gravity settings (slow, medium, fast, 20G), two rotation systems (TOD rotation and TGM rotation), two songs, and the option to enable garbage. Due to the NES palette limitations, the placed pieces were dithered with the colours of J, L, and S, as well as the black background.

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