Chocolate Rain

We've an early cooperative game, Sauerbaum, dating from the 1980s.  The theme is that acid rain is falling and damaging the tree.  The players are running round the tree canopy gathering up the acid raindrops (I didn't say the theme made any sense...) before they reach the roots and we lose.

The supplied plastic 'raindrops' look rather like smarties.  It's better with actual Smarties, though that can lead to lower scores than otherwise...