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 is no problem getting the O piece to here
But if the ledge is further under the overhang we have a problem
The piece can not move left until this point
It cannot move left two spaces before it has dropped more than zero spaces
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.
Just holding left from here won't get the I piece in place
Hold left and rotate (either direction) just after this point
As long as the gravity isn't too strong at this point in the game, you'll get to here (or a space above or below)
Rotate the I piece into place
With L and J pieces[]
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 of the L/J shuffle below.
Lower the L in this orientation
Start to hold left
Just as the L begins to move left, rotate anticlockwise
The L is moving through the corner piece: keep holding left and soft drop it into place
Finished square
With the opposite multisquares (L on the right or J on the left), the third piece requires some tactical rotation if there is not enough support underneath.
Lower the J piece in this orientation, holding left as soon as possible
The J starts moving left at this point – immediately rotate clockwise
The piece in place
If there is sufficient free space above the construction, an easier method can be used (shown below).
L/J swing[]
This is useful when building a spiral L monosquare on the right or a spiral J monosquare on the left as above, provided there is enough free space above the construction.
