bascnab
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:
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There is no problem getting the O piece to here
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But if the ledge is further under the overhang we have a problem
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The piece can not move left until this point
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It cannot move left two spaces before it has dropped more than zero spaces
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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.
Examples
Reaching under overhangs
With I pieces
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Just holding left from here won't get the I piece in place
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Hold left and rotate (either direction) just after this point
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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)
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Rotate the I piece into place
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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.
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Lower the L in this orientation
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Start to hold left
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Just as the L begins to move left, rotate anticlockwise
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The L is moving through the corner piece: keep holding left and soft drop it into place
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Finished square
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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.
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Lower the J piece in this orientation, holding left as soon as possible
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The J starts moving left at this point – immediately rotate clockwise
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The piece in place
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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.
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Firm drop to this position
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Rotate clockwise twice in quick succession
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The piece in place
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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).
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Once the L is clear of the overhang it needs to slide two positions left to lock in place. This can't be done just by holding left
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Firm drop the L to hang off the edge
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Hold left, rotate clockwise then anticlockwise in quick succession
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The L is moving through the corner piece. Keep holding left and soft drop, so it slides left as soon as it can.
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Completed square
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S/Z pop
This move is required for ZLLZ/SJJS, TTLZ/TTJS and LJZI/JLSI multisquares. All rotations should be reversed for the right-hand versions.
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The space marked with  must be free. The move is easiest if the space to 's left is also free...
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That surely won't fit...
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Firm drop to here, then rotate in either direction
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Easy
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If the space indicated is taken there are two other ways
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The easiest is the S/Z wiggle: firm drop to here, then rotate clockwise then anticlockwise in quick succession
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The Z piece is sliding down from this position. Firm drop it.
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Job done
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The second of the two rotations can be performed alone, but this isn't as quick or easy. To do it, rotate anticlockwise just after the Z is in this position...
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...before it gets to here
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Building a T monosquare quickly
The quickest way to add the final piece of a T monosquare is to spin it into place:
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Firm drop the backwards-oriented T piece
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Rotate the piece twice quickly
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Finished square
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If there is no free space above:
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With the T piece oriented backwards hold left and soft drop
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It catches in the gap. Rotate the piece twice quickly
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Finished square
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