Please note that the smooth lightning is a bit borken on stairs/slabs. But we are working on it! So here is the 12w39a changelog: Lighting system overhauled. Lots of blocks interact correctly with lighting now (stairs, slabs) Few sound tweaks Fixed witch being white for some More bugfixes & slight tweaks! Download the snapshot here: Client: http://assets.minecraft.net/12w39a/minecraft.jar Server: http://assets.minecraft.net/12w39a/minecraft_server.jar (or EXE) If you don’t have Minecraft you can download the launcher here: http://www.minecraft.net/download // The Minecraft Team