2003 shooter Crimsonland gets browser-native online co-op via rollback netcode
banteg · x · 2026-10-24
Developer banteg added online co-op to the 2003 top-down shooter Crimsonland, running entirely in the browser: open the page, hit play co-op, and share the link — survival mode and all stock quests supported.
Technical details: it uses the original game's own two-player mode, so it plays exactly like couch co-op. Under the hood is rollback netcode — each game runs ahead on local input and silently corrects when the partner's input arrives, so moderate lag doesn't ruin aim; a Cloudflare relay handles cases where direct connection fails. The port also gets verified leaderboards and replays. Screenshot shows a 14:30 run scoring 3.3M for first place.
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