[Puzzle 101] #1 - Symmetry Principle

Tetris puzzles can be solved intuitively in under 3 seconds using symmetry — no counting needed.

Basic Principle

1. Draw a diagonal that mirrors both halves. 2. Place large pieces first to narrow possibilities within symmetry. 3. Place remaining small pieces. 4. If that fails, count cells the traditional way.

Additional Verification

From Canyon #4 through Wuling, puzzles are almost always symmetric (~97%+).

Individual pieces may be asymmetric but their combined shape is symmetric.

Assume symmetric solutions and fit pieces into large symmetric blocks — no cell counting needed.