This article is a stub. You can help the Celeste Wiki by expanding it.
Bubsdrop is a well-known trick in Mirror Temple B-Side, allowing players to skip getting the first key by performing a precise jump. The trick is performed by going through the vertical screen transition in the long horizontal room in Central Chamber, then by performing a tiny jump (1 or 2 frames) you can fall back through. Then, by dying either by retrying or by falling, you will be respawned on the right side of the room, skipping the first key!