November 29, 20213 yr It's based on the free version that used to be available as a java applet at https://web.archive.org/web/20130928045438/http://minecraft.net/classic/list. This version was 0.30 set to "creative" mode, which had survival features disabled and infinite blocks. It's called c0.30-c in the Betacraft launcher.
Title - Just want to know what version it is exactly based on.