Connect four on a seesaw. Every piece pulls the board down on its side — load one end too far and the stack avalanches downhill.
Click a column or press 1–7. R starts a new round. The ghost piece shows where it lands; the ghost needle shows the torque you'd leave behind.
Each piece adds its distance from the centre column to the balance: a piece in column 7 counts +3, one in column 1 counts −3. The gauge sums them all.
Past ±8 the board tips. Any piece sitting on top of a stack rolls one column downhill whenever the next column that way is shorter — and it keeps cascading until nothing else can roll. Rolling downhill makes the board heavier on that side, so avalanches feed themselves until the pieces jam against a wall or level out.
Four in a row on your drop wins on the spot — the board never gets to tip it apart. An avalanche can also finish a four, for either player, so watch what you're shaking loose. If it completes both at once, the player who dropped takes it.