DTET Rotation System

The DTET Rotation System is the rotation system used in the fan game DTET. Although sometimes referred to by the abbreviation D.R.S., both the abbreviation and expanded form are informal names. The system was not given a specific name by Mihys, the author of the game.



This is how they appear to rotate in free space. What I suspect is actually happening, is that the pieces are rotating through 4 unique positions, like in SRS, but always prefer to be touching the bottom of their bounding box, like in TGM rotation.

Pieces spawn in the center, (left of center for the odd width pieces) with their topmost solid block in row 20.

Forum user B.G. posted a loose translation of how it works in the forum:


 * A case of counter-clockwise
 * If cannot rotate, move one space to the left.
 * If cannot, move one space to the right.
 * If cannot, move one space to the down.
 * If cannot, move one space to the down & move one space to the left.
 * If cannot, move one space to the down & move one space to the right.


 * A case of clockwise
 * If cannot rotate, move one space to the right.
 * If cannot, move one space to the left.
 * If cannot, move one space to the down.
 * If cannot, move one space to the down & move one space to the right.
 * If cannot, move one space to the down & move one space to the left.


 * If push counter-clockwise button while pushing clockwise button, clockwize-like counter-clockwise rotate.
 * If push clockwise button while pushing counter-clockwise button, counter-clockwize-like clockwise rotate.

This system works double rotate too.