Lönn

What Lönn is

Lönn is a free visual level maker and editor for the game Celeste. It can edit existing map binaries, create new maps, add rooms, and place game objects. Its tools cover object selection and placement, tiles and brushes, layers, stylegrounds, 2D levels, tilemaps, and entities. Maps created in Lönn can be loaded in the stock game or with Everest, which the project recommends. Windows and macOS releases are downloadable ZIP files, while Linux users on systems supporting AppImage can run that release; other operating systems require LÖVE 11.3 or later. Mod developers can add compatible Lönn plugins to their mods, and the project wiki documents plugin creation for entities and triggers. Lönn is under active development and is an unofficial fan project, separate from the Celeste development team. A key limitation is map preservation: it cannot currently save every part of original maps, with coverage estimated at about 99%, so the README recommends backups.