I’m pretty much certain that almost everyone knows about Minecraft by now?
In Minecraft, players explore a blocky, procedurally-generated 3D world with infinite terrain, and may discover and extract raw materials, craft tools and items, and build structures or earthworks. Depending on game mode, players can fight computer-controlled “mobs”, as well as cooperate with or compete against other players in the same world. Game modes include a survival mode, in which players must acquire resources to build the world and maintain health, and a creative mode, where players have unlimited resources. Players can modify the game to create new gameplay mechanics, items, and assets.
As of version 1.6, Minecraft no longer supports computers running anything earlier than Java 6 (including PowerPC Macs) as Minecraft 1.6 uses a new launcher that isn’t compatible with older Java APIs.
Therefore, these special versions taken from those good people at https://macintoshgarden.org/ and mirrored here are the last known customised versions to be compatible for G4 and G5 PowerPC Macs.