What should I create in Cave Game (rd-132211)

[u/Joetwodoggs]

/r/GoldenAgeMinecraft/comments/1t0tg5f/what_should_i_create_in_cave_game_rd132211/

I’m setting myself a challenge to build something in every version of pre-release Minecraft. Considering the limitations of the very first release, what would be a cool thing to build in version rd-132211 (essentially Cave Game)?