Tactical rotation

The New Tetris uses smooth falling animation for tetrominoes. The way this implementation mixes the falling animation with collision detection means that when a tetromino must be moved under an overhang to reach a ledge, by the time it has moved left one space with no support it has dropped more than zero spaces. In some cases it can therefore not reach a ledge.

Nothing can be done in the case of the O piece:

There are, however, ways of getting a piece other than O further under the overhang by making use of "tactical rotation": rotating the piece in the right direction at the right time.

L/J shuffle
This is useful for completing spiral L monosquares on the left and spiral J monosquares on the right (in which case the move is reversed). If the space above the block is already occupied in such a way that the L cannot be overhung as in the second figure, a trickier version can be performed:

S/Z wiggle
This move is required for ZLLZ/SJJS and TTLZ/TTJS multisquares. The move is reversed for SJJS and TTJS multisquares.

Reaching under overhangs
This works in a similar way to the trickier version of the L/J shuffle.

This can also be done with I pieces:

Building a T monosquare quickly
The quickest way to add the final piece of a T monosquare is to spin it into place: If there is no free space above: