01the idea
the first game is the world you play in. the second game is the hero you play as. the real engines run in your browser, and one runtime drops the hero into the world.
carmageddon
the game you play in. its maps, its rules, its physics.
1997 · racing · 7 mb
doomguy
the hero you play as, with its own moves, powers and health.
from doom · +0.3 mb
doomguy from doom in carmageddon
not created yet · be the first to create it
now: doomguy from doom in carmageddon
order matters. swap them and it is the eagle in doom.
02both ways
inside a crossover the two games talk all the time. what happens in doom reaches lara croft, and what lara croft does lands back in doom. here is one real frame, taken apart.
one real frame of lara croft in doom, taken apart into four layers: the world, the collisions, the hero, one frame. scrolled, they collapse into the frame you play.
five kinds of signal, in both directions, in every crossover.
| signal | worldhero | heroworld |
|---|---|---|
| damage | monsters, traps and falls hurt your hero | your hero's attacks hurt the monsters |
| doors | the world's doors, lifts and switches | your hero presses use and they open |
| pickups | health and armor lying around the world | your hero picks them up and heals |
| explosions | barrels and rockets throw your hero around | your hero's blasts break props and walls |
| cars | racing worlds bring roads, ramps and rivals | a car hero drives into any world |
that is the whole idea.
now make one.
no. you do not need to own, download or install anything. the games run right in your browser tab.
the first load pulls in both games, between 1 and 75 mb depending on the crossover. after that you just play.
these games were made for a keyboard and a mouse (a gamepad works too) and they want a real graphics card. so the player opens on a computer.
on a phone you can still browse every crossover, see the previews and follow the token.
every crossover starts not created yet. the first person to create one burns $CROSSPLAY for it and owns it forever. their wallet goes on the crossover page and they earn a share of the fees while people play it.
after that anyone plays it for free, as much as they like.
creating one costs 10,000 tokens. the tokens are burned on chain, gone for good. the for nerds part shows how the burn is checked.
bought on pump.fun with the pump.fun wallet? it does not show up in browser wallets. export it, or send your $CROSSPLAY to a browser wallet (phantom, solflare, backpack) first.
4 of 182 crossovers are created so far.
every trade of the token pays a small creator fee. every 3 hours those fees split in two.
every payout is published on chain with its transactions. there is no buyback.
tokens burned to create crossovers leave the circulating supply for good. 182 crossovers at 10k each is 0.18% of the supply, once all are created.
nothing here is a promise of profit. payouts follow fees and playtime.
the official address is the one on this site and on our x. both always match. it is a pump.fun coin on solana.
anything else, in a dm, a reply or a group chat, is not ours. never buy from an address someone sends you. check it here first.
yes. every crossover is built ahead of time and played by a test bot. it walks, jumps, takes damage, dies, respawns and counts errors.
then people watch the frames in motion, because a bot happily passes a crossover that still looks wrong. the long version is in for nerds.
04for nerds
the long version. the world is the original game's own engine compiled to webassembly, untouched where it counts. the hero is a pack that one shared runtime drops into that engine's frame.
the world game runs as its original engine compiled to wasm and draws its own frame, and sends frame, depth and collision to the crossplay runtime. the hero game supplies a hero pack, which sends pose and input. the runtime, three.js plus rapier, puts the hero into the world's frame inside one iframe in your tab.
these are the real engine files your browser loads, one per game, ported from the original source. hover a game to watch it run as a world.
14 engine files60.6 mb in allhover a game to watch it run
the result looks the same either way: the hero is depth tested, so walls in front still hide it. what differs is who owns the canvas.
for worlds that already draw with webgl2. the world owns the canvas.
used by carmageddon, half-life, quake iii, simcity, sonic robo blast 2, tomb raider + 6 more
for worlds with a software renderer. the runtime owns the canvas.
used by diablo, doom
a test bot boots each pair and plays it: it walks, jumps, uses every ability, takes damage, dies, respawns and counts console errors.
a pass from the bot is not enough. people watch frame sequences in motion, because scripted checks happily pass things like a giant held sword, inside-out models or a car stuck on a one block step.
05man crossplay
crossplay runs a classic game as the world and drops the hero of a second game into it. the world keeps its maps, rules and physics. the hero keeps its moves, powers and health.
order matters. mc+srb2 puts sonic in minecraft 1.8.8. srb2+mc puts steve in sonic robo blast 2.
damage, doors, pickups, explosions, cars. both ways.
every 3h. 50% crossover creators by playtime, 50% infrastructure (servers, game streaming). no buyback.
desktop only. phones get previews, not the player.
create(0), play(1), crossovers(2), token(3), how it works(4)
