Second game mode selectable at dog select (host-authoritative online):
- js/sim_arena.js: top-down sim, same export surface as sim.js — x/y plane
plus a z hop axis (Space / comma); KOs by knocking dogs into abyss pits
- js/mapgen_arena.js: mirrored symmetric arenas — walls, pits, center
clearing, guaranteed spawn-to-center corridors, crystals/spikes/launch
pads, mirrored saw pairs; fallback pit pair since pits are the only KO
mechanic
- specials re-imagined per dog: zoom dash, ram + hop-slam, zip-leash
slingshot, blink, hover (floats over pits/saws/spikes)
- render: arena tiles with wall shadows + void pits, top-down dog drawing
with z-lift over a ground shadow; new fall event/sfx
- B.HOP input bit so 'up' can mean north in top-down (Space also jumps in
side view); mode toggle UI + mode carried in start/rematch net messages
Tested: arena mapgen determinism/symmetry/connectivity + chaotic matches +
pit/hop scenarios headless; local chaos + full P2P arena match (host mode
flip syncs to client) in two headless browsers with zero page errors.
Sim: clamp knockback under tile size (wall tunneling), bomb/ball terminal
velocity, grapple constraint no longer drags players into terrain, bite
window ends on getting hit, shield/boost cleared on death, spawn invuln
preserved through countdown, spike/saw events only on real damage.
Mapgen: spawn footprint validation (was embedding dogs in 58% of seeds),
saw paths rejected if they grind terrain or sweep spawns, towers no longer
hang slabs over pits. Net: heartbeat+watchdog for dead peers, broker-error
tolerance once P2P link is up, join/host reentrancy guards. UI: text-field
keystrokes no longer hit game hotkeys, audio unlocks on mouse, textBaseline
leak, snapshot carries onGround/landT so client dogs animate.
5 dogs with distinct movement physics, seeded procedural arenas with
traps and mineable powerups, smash-style knockback/stocks combat,
local 2P and P2P netplay (PeerJS room keys), procedural art and sfx,
headless sim smoke tests.
