Sega Master System / Mark III / Game Gear
As provided to developers for reference.
The only differences between the v0 and v1 ROMs are in the graphics for the jewel and square block sets.
v1 switches the shape of the purple and green jewels, and simplifies the design of the squares. The differences can easily be seen on the options screen which is shown before starting the game:
|Options Screen [v0]||Options Screen [v1]|
There are both code and data differences between the v1 and v2 ROMs. These include:
|Options Screen [v2]|
|[v0] & [v1]||[v2]|
Columns overflows twice: when the block counter goes beyond 69999, and when the score goes beyond 999999, as seen in this video.