Block 1

Block 1 (aka "Glitched Grass") was a notorious glitch block that can be placed instead of Grass in early versions of the game. It looks exactly the same as Grassy Dirt with the exception being the mysterious lining of transparency found on each side. It is no longer placeable as of Alpha 0.2 and can only be obtained by hacking.

Block 1.06
There was an error when loading a saved game that included grass Block 1.06 would be created instead. It was due to a mandatory rounding in the save function. This has since been fixed, as Grassy Dirt's ID was changed from 1.0625 to 64.