ViColumn

ViColumn is, as one might guess, a re-implementation of Sega’s Columns
for the VIC-20. Blocks of three vertically arranged colours, out of a pallette
of four, come dropping down from above, and must be placed on the bottom or on
top of another block. By pressing fire, you can rotate the colours inside the
block so as to fit in with the colours of other blocks already placed on the
screen. If three or more adjacent blocks have the same colour on a row or
column, that colour block is eliminated, making room for more blocks.
Carefully laying down the blocks can lead to chain reactions. Unlike the
original Columns, though, this implementation does not recognise diagonal
colour combinations.

ViColumn