Rain

Rain is a feature activated by pressing F5 ingame in Classic. It will only fall where the sky isn't blocked, and currently has no effect on gameplay. Rain is a single moving sprite. When it falls on a block it makes a splashing effect. To reduce frame rate, rain isn't replicated all throughout a map. It is instead one sprite on all sides of the player. When the player goes inside and far away from the falling rain it disappears but reappears when you move close to outside again.