On your turn you drop one spooky disc into two different columns at once — it hovers at the top of both as a superposition (e.g. X₁ shows in two columns, joined by a thread).
Discs entangle the columns. When the threads form a loop, the board collapses: each entangled disc drops into one real column, stacking like normal Connect Four. The player who didn't close the loop chooses which way it falls — tap one of the glowing columns.
Get four real discs in a row — across, up, or diagonal — to win. If one collapse completes four for both players, the line finished with the lower move number wins.