The Dropper by Bigre is one of those maps that does one thing and does it perfectly. You spawn at the top of a level, gravity takes over, and your only job is to survive the fall. Each of the 16 levels is a themed vertical playground — a clockwork factory, a disco inferno, an impossibly surreal dream sequence — and threading the needle between obstacles at terminal velocity is somehow both terrifying and addictive. The only rule is simple: don't break blocks. Everything else is instinct and reflex.
Every level hides a diamond, rewarding players who learn the stage well enough to divert mid-air and grab it without dying. There's also a bonus level at the end for those who clear the main 16. It sounds minimalist on paper, but the creativity of the level design is what made The Dropper go viral — level 13 alone has been the subject of dozens of reaction videos, and speedrunning the full map has become its own community scene.
Bigre later released The Dropper 2 (Newton VS Darwin) and a Remastered version that's 10× larger with over five minutes of continuous falling. If you've never played the original, start there. It's fast, punishing, and one of the most distinctive Minecraft experiences ever designed around the game's physics engine.