Minecraft Alpha 1.2.6_01 is not the "best" version of Minecraft. By objective metrics, it is unstable, ugly, and missing 90% of the content that makes the modern game a masterpiece.
In Alpha 1.2.6, pigs can be ridden but not controlled. This update introduces the first attempt at "controllable" transport. minecraft alpha 1.2.6-01
The height limit was strictly 128 blocks, exactly half of the 256-block limit introduced much later in 1.2.1. Minecraft Alpha 1
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And then a Creeper will fall from a shadow you didn't see and instantly delete your existence. And you will smile. it is unstable