In Japanese, Full-width space is often used. but it displayed such as "IDSP".
so, I saw the Unicode list in Wikipedia and I looked at U+3000 that is Full-width space, It is true space.
But, I saw Minecraft Font Texture-unicode_page_30.png, there is "IDSP" not Full-width space.
So, Japanese people who are playing Minecraft are using Half-width space.