Playing forever in Gravytris

Gravytris can be played forever assuming piece flip and gravity gun are available. Piece previews are not required.

SZT pieces

Becomes 1210.

When worst case such as ZZ, ZS, SZ, SS skim like this:

Becomes 0112 or 0121.

Becomes 2101 or 1201.

Becomes Flat or 1021 or 1210 or 1012.

Becomes 2110 or 1210.

For others mirror diagram and positions.

Alternate putting I piece on column 5 and 6 to reap tetrises. Borrow pieces if sides are too high.

This happens unlikely, but if center is too high, and you get many I pieces in a row, put them on the sides.

Put them on the right side as advantegeous. Use gravity gun to change decision.