A stripped down Tetris clone for the C=64 (no points, no levels, no nothing, except the bare block falling, controlling and colliding mechanism), in about a KLOC of 6502 assembly.
Assembly
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README.md

Tetris-464

Assemble into a .prg with KickAssembler, and optionally run with x64 (from the VICE emu suite):

$ java -jar KickAss.jar tetris.asm [-execute x64]

With the -execute option, it should autoload/start.

Keyboard controls: WASD

screenshot