Because _03 is not an official release, your download method depends entirely on whether you want the real, un-glitched game or the horror mod experience. 1. Playing the Closest Official Versions (The Safe Way) Java Edition Alpha v1.2.0 - Minecraft Wiki
Welcome back to 2010. Watch out for Creepers—they explode instantly in this version with almost no fuse delay. Happy mining. Minecraft Alpha 1.2.3-03 Download
Versions found outside official Mojang sources (like the Minecraft Launcher ) can be unstable or modified by third parties. Always back up your saves and scan files for safety before running "mystical" builds. Because _03 is not an official release, your
The Alpha 1.2.x series was a period of rapid-fire bug fixes and tweaks, typical of Minecraft's early development. typical of Minecraft's early development.