- ⊕
Superposed pieces are two shapes at once, e.g. (|T⟩+|S⟩)/√2. A move only works if both shapes fit. When either shape touches down, the piece is measured: 50/50 which one becomes real.
- Z
Phase flip (F) turns the piece into |−⟩ antimatter. A cell that lands on a cell of the opposite phase annihilates with it: |+⟩+|−⟩ → 0. Use it to dig out holes.
- 〰
Entangled pairs: two consecutive pieces share a Bell pair. Clear any of their cells and every other cell of the pair vanishes too.
- 👁
Measure (Q) collapses a superposed piece right now.
- ⇣
Tunneling (T): the piece passes through blocks to the next free spot below, with probability e−0.6·w for w rows of blocks.
- +
You get +1 Z flip and +1 tunnel every 5 cleared lines (5 at most).