Multiplayerup to 4 players, in the game's own lobbies
How to join The host opens "Multiplayer", invites Steam friends with the "+" button and picks "Start Private Game" once everyone is in; friends accept the Steam invite. Everyone playing needs this mashup from Melty.
Play with your friendsSend them the game
About
Portal Rain its broken after hallowed concepts
Risk of Rain 2 with Portal 2's portal gun: fire linked blue and orange portals, keep momentum through them, and let shots and monsters travel too.
What you get
G blue portal, H orange portal, Q alternate (aim at terrain, up to 120 m)
One linked pair per player, in co-op colors, for up to 4 survivors
Momentum flings and combat teleport (projectiles + monsters)
Reads your Portal 2 install for companion assets; sounds fall back to RoR2's own
Requirements
Risk of Rain 2 + Portal 2 (Melty installs BepInEx 5 for you)
Known limits in 0.1.0
Single player verified; co-op pairs are per player but a 2-client join test has not been run yet
Portals place on terrain only, last until replaced or the stage changes
Credits
Portal 2 by Valve; Risk of Rain 2 by Hopoo Games / Gearbox (unofficial fan mod)
BepInEx by the BepInEx team; code MIT, built with OpenCode + universal-modder toolkit.