Known Features

This is an implementation-backed feature inventory, not a roadmap.

Gameplay

Endless Classic wave survival with Easy, Medium, Hard, and Adaptive difficulties.
Tutorial with paused steps, unlimited training health/stamina, progressive enemy introductions, and practice arsenal access.
Eight maps, selectable atmosphere, random map selection, automatic weather with gameplay modifiers, and continuous day/night cycle.
Score-gated eight-slot arsenal, headshots, ADS, recoil, reloads, shell ejection, rocket splash damage, and weapon inspect.
Stamina-limited sprint, jump, crouch, collision/wall sliding, cover, barrel hazards, damaging lava/toxic/ice pools, Sentinel turrets, combos, and killstreaks.
Named wave shapes — Horde, Elite, Siege, and Ambush — that re-weight the mix, spawn distance, and pacing of roughly 45% of solo waves from wave 4.
One-slot loot powers, killstreak airdrops, rare Nukes, skill modifiers, solo Mystery Box perks, and generated Classic run modifiers.
ARK-07 relay network: several per-map radiation-field spires that overclock nearby enemies with a damage/speed/self-repair charge that lingers well after they leave the field, jam the player's held equipment, and pay bonus score for field kills; plus random, difficulty-scaled Overdrive Surge (EMP-triggered, buffed/red-eyed wave) and Null Wave (corrupted, screen-glitching wave) modifiers.

Eight classes with active abilities, passives, class shadow silhouettes, and multiplayer replicas.
Ten moving enemy archetypes: Normal, Fast, Tank, Sniper, Boss, and Revenant, plus the solo-only tactical set — Bulwark (frontal shield, must be flanked), Howler (shields nearby allies, must be prioritised), Leaper (telegraphed cover-clearing pounce), and Splitter (bursts into three on death).
Crowned Elite Tanks, Boss enrage/summons/blinks with a per-hit bullet damage cap, Revenant shields/blinks/regen, and Subverter hacking interactions.
Perception, pursuit lanes, surround behavior, patrol/investigate states, line of sight, ranged kiting, melee telegraphs, bullet dodging, per-archetype turn rates, and a solo swarm-wide tactical director that reads player strategy.
Enemy pooling, shared materials, terrain spatial hash, high/medium/low/cull LOD, and distance-gated shadow casting.

Persistent account auth, username/password flow, profile customization, privacy controls, leaderboard opt-out, password change, and full account deletion.
Solo/multiplayer stat tracking, difficulty-weighted rank XP, skill points, nine skill upgrades, 31 achievements, and achievement titles.
Per-weapon L0–L10 mastery with persistent XP, reload/recoil/magazine benefits.
UTC daily challenges drawn from a 71-entry catalogue on a cycle-shuffled rotation, with a claimable skill-point reward.
Photo Mode with filters/adjustments and cloud-saved images under a per-player cap.

PeerJS lobby creation/joining, host kick, name collision rejection, heartbeat timeout handling, and optional time limits.
Host-authoritative shared enemy world, host-synchronized waves, guest hit reporting, kill credit, targeted enemy-damage messages, and host-authoritative ARK-07 relay placement/wave-modifier sync.
Timestamped player/enemy snapshots, interpolation, short packet-loss extrapolation, and teleporter-buffer resets.
Remote character models, weapon poses, crouch/aim animation, health bars, nameplates, scoreboard, chat, emotes, minimap, spectators, and result screens.

Responsive desktop and touch HUD, dynamic crosshair, hit markers, kill feed, damage direction, boss health bar, minimap, and mobile orientation gate.
Rebindable keyboard controls, settings persistence/sync, haptics, colorblind filters, frame caps, hardware auto-detect, and graphics presets/custom mix.
Procedural Web Audio weapon and combat effects with 3D positional playback, layered explosions, material-matched bullet impacts, enemy vocalizations, plus bundled menu music.
Runtime-generated weapon surfaces: Sobel-derived normal maps, six per-weapon finishes, constant world texel density, and a shared cavity-occlusion term — the project ships no image texture assets.
Bore-anchored muzzle flashes, elongated tracer projectiles, shader warmup, custom sky/haze, HDR environment lighting, weather particles, procedural terrain materials, HDR post-processing, photo filters, particles, impact effects, and relay-interference/signal-glitch screen effects.
Optional Rapier solo ragdolls with lightweight fallback.

For numeric details and behavior caveats, use the linked system pages rather than treating this overview as the sole specification.