Flying Hats
The best way of describing this is , it's like tiddly-winks, but with little plastic flippers and hats.
With different zones for scoring and the chance to deliberately flip your 'hat' into the nearest pot plant, fish tank or other player's drink, this used to be a great favourite at Christmas. Also because it was really just a game to test your aiming ability , you could play it solo( and let's face it I was an only child so I did!) The plastic pieces seemed to be fairly heavy duty, in my whole childhood it survived intact, despite much use. Another great one to grab if you spot it secondhand.