Every number in the game. Edits apply live and are saved to src/tuning.overrides.json — tuning.js is never rewritten, so your comments and defaults survive. restart means it's cached at boot; next spawn means it applies to things created from now on.

The level, as rooms. A room owns its pieces, spawners and triggers; anything outside a room is a separate room. Saved to src/layers.json and pushed live to everyone connected. No level at all is the normal state — the arena is not a room.

1–5 tools · H hitboxes · Ctrl+Z/Ctrl+Shift+Z undo, redo · Ctrl+C/V/D copy, paste at the cursor, duplicate · Ctrl+A everything on this layer · Ctrl+[ Ctrl+] move it a storey · Ctrl+S save · shift-click or drag a box to take several · shift+arrows nudges 10 · hold ALT to ignore every snap.

Your wave GROUPS. Each is a preset — its enemies, and the waves it may spawn on (7, 3-7, 10+, all). A wave draws one of the groups allowed on it, by weight. A balanced group is pushed to the wave's target threat for whoever is in the arena — swapping some bodies for harder ones (or easier) and adding or removing — while an unbalanced one spawns exactly as written. roll shows you what it would do. A wave no group covers falls back to the endless formula. Saved to src/waves.json, live.