Game ends when part of a placed piece is above the top.
Clearing a line makes all separates all pieces touching it into independent blocks.
When a powered up piece is placed, all placed blocks become independent and loose.
Clearing more than X lines activates a piece picker.
Every X pieces placed a big piece appears.
Hold ability.
Many options, controls, and colors can be configured.
Every X lines a Friend appears. They will either buff or debuff for the next X pieces placed.