12 Coins

A riddle I saw on Ted ed Riddles.

You have 12 coins, one is a fake. You don't know if the fake is lighter or heavier than the normal ones. You must find the fake by using a balance scale up to 3 times. You can draw on the coins to aid you.

Press R to START.

SPACE to weigh.

Left click (hold) to grab a coin. Right click to freeze a coin - then left click to draw on it. Mouse wheel to rotate a held coin.