Skill Arcade Challenges

Design a challenge for nvim-skill-arcade. A challenge is data: a start buffer plus the expected end state. Any key sequence that reaches it wins. Try it as you write it, here or in Neovim. Your reference solution is replayed by CI before anything is published, and no uploaded code is ever executed.

1. Describe the challenge

2. Expected end state

Trailing spaces and blank lines at the end are ignored.

More assertions and presets (windows, tabs, quickfix, diagnostics, marks)

Presets: diagnostics plants warnings on those lines ("ARC: ..."), splits opens three windows, alt_buffer puts you in a second buffer, quickfix_hits fills the quickfix list with those lines.

3. Reference solution and lesson

Plugin tips (shown to players who have that kind of plugin)

Result

    
      
    
        
        
        Submit as pull request
      
    
      
    "Submit" opens GitHub's new-file page prefilled with this challenge; GitHub forks the repo and opens a pull
      request for you. CI replays your reference solution (must fail at the start and pass after your keys) and a maintainer reviews it.
      If the link is too long for your browser, use Copy JSON and add challenges/<id>.json yourself.
    
    
    

    
    
      
    Play it
    
      
    Stock Vim emulation in the browser, not your Neovim: your own keybinds and plugins are
      not active here, and some keys (windows, quickfix, :g with ranges, registers beyond the basics) may behave
      slightly differently. Use Test in Neovim below for the real thing.
    
      
    
      
    
        ready
        keys 0 / par -
        0.0s
        normal
      
    
      
    
      
    Click the editor and play. The clock starts on your first key.
    
      
    
        
        
      
    
      
    
    

    
    
      
    Join in Neovim
    
      
    Your draft gets a room code. Paste it in Neovim and play with your own keybinds and
      plugins. Nothing is saved: no points, bests or stats. The code carries the whole draft, so there is no upload and nothing to clean up.
    
      
      
    
        :ArcadeJoin ARC1.
        
      
    
      
    
      
      
        
    1. Press Copy command.
      2. 
        
    2. In Neovim paste it and press Enter (:ArcadeTry works too).
      3. 
        
    3. Solve it your way. Fix the draft here and copy again.
      4. 
      
    
      
    
        Prefer a file?
        
        
        
    :ArcadeTry ~/Downloads/challenge.json
        
    
      
    
      
    
    
    

    
    
      
    Check the reference keys
    
      
    Replays your reference keys on the start buffer with a small approximate interpreter
      (common normal-mode keys only). Neovim and the CI replay are the authority.
    
      
    
      
    
        
    
        
    
      
    
      
      
    
    
    

    
    
      
    Published challenges
    
      
      
    
      
      
      
      In Neovim: :ArcadeSync downloads them. They join your runs and practice, marked as community.