BLOCK ROYALE

BLOCK ROYALE is a shooter game that loads straight in the browser. Free to play, no install, no registration. It takes after Battle Royale. It was written by Opus 5.5, and the prompt behind it is printed further down this page. It can be played online with other people. It works on a phone as well as a desktop.

About BLOCK ROYALE

BLOCK ROYALE is an online battle royale for 50 players, a top-down shooter drawn in chunky 2.5D blocks where the last one standing wins. Each match opens in a waiting arena full of players punching crates. Then a plane crosses the island: jump when you choose, hold Space to dive faster and steer your parachute down. Crates and houses hold 24 guns, from twin pistols to a flamethrower, in six rarities, plus ammo, heals and five kinds of grenade. The safe circle shrinks in seven waves, the gas outside hurts more each wave, and airdrops bring the best guns. The plane's path, loot and circles change every match.

Move with WASD, aim with the mouse and click to shoot. R reloads, E opens doors and crates and picks up (swapping when all six slots are full), 1-6 or the wheel switches weapons, G drops and M opens the map; the minimap always draws a line to the safe zone. On a phone held sideways, the left thumb moves and the right aims and fires. Real players meet on the game's own WebSocket server, with a match every 20 seconds and bots in every empty seat; offline, it plays against bots. Eliminated, you watch your killer, then see your place, kills and time alive, and earn XP and coins toward outfits, hats and parachutes, plus three daily challenges. The leaderboard keeps your best match. First time: jump late, land away from the plane's path and grab the first gun you see.

How was BLOCK ROYALE made?

Creator

Drakoniux

Model

Opus 5.5Anthropic

Effort

Max

Cost to build

$173.49

Tokens used

9,663,675

Build time

300 min

Multiplayer

yes

On phones

plays on mobile

The prompt behind BLOCK ROYALE

The creator asked for a 50-player online battle royale with the whole loop: a bright lobby with a Play button, a waiting area where everyone wanders and smashes things until "Starting in N", a plane that crosses the map while you choose when to jump, Space to fall faster, crates of guns that hand over their ammo, a six-slot hotbar coloured by rarity where F swaps when it is full, a map that shrinks in waves and hurts outside, spectating whoever killed you, a results screen with kills, place and time alive, and a minimap line that always points to the centre. All of it in the 2.5D look and gun feel of their earlier top-down shooter, with some flavour of its own. They chose the name BLOCK ROYALE, real online players rather than bots alone, and solo matches first. Claude wrote a build spec and had three parallel agents draw the characters, the island and the lobby while it wrote the match: one authoritative 30 Hz simulation that runs in a Cloudflare Durable Object per match and, unchanged, inside the page when no server answers, with client-side prediction, binary snapshots, bots in three skill tiers that path-find through doors, seven gas waves and airdrops. Bot-only soak matches checked pacing and stuck bots; an independent reviewer agent then found eleven bugs, among them a hidden tab that never landed, slots that desynced and a cosmetic id that broke the canvas, and each is pinned in a regression test. The key art is a staged moment in a real match, drawn by the game's own renderer. Version 1.1 came from the creator's first play-test: E for every interaction instead of F, parachutes that had been flipping open and shut 15 times a second, bullet hits that sprayed sparks like a sparkler, a kill feed that replayed every row on each kill, and houses without windows (most had none; now every wall has glass). In 1.2, after the second play-test, bullets that hit something just stop, with no particles at all, and the mouse cursor stays visible after you die (it had been hidden everywhere except over the Continue button). Version 1.3 made it mobile friendly: on a phone held sideways the left thumb moves and the right aims and shoots, with a light aim assist, the prompt under the player becomes the yellow button that jumps, dives, opens and picks up, the menus pack tighter to fit a phone's height, and an upright phone is asked to turn. In 1.4 the creator asked for more weapons to choose between: ten new guns and two grenades, each with its own mechanic: twin pistols that fire in turn, a double barrel, a tactical shotgun, a marksman rifle, a scoped rifle, a rifle whose every fifth round bursts, a submachine gun whose rounds ricochet, a silent crossbow, a flamethrower that leaves people burning until they find water, a grenade launcher whose shell bursts where you aim, a sticky bomb that rides on whoever it hits, and a fire bomb that leaves a burning patch. Built in Claude Code with Claude Opus 5.5 at max effort.

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Version 1.4 · updated 2026-10-29

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