Survival game mode places dead players into observer mode until a live player reaches a checkpoint.

Cyclic mode: Players can only respawn out of observer mode when the map explicitly requests so.

Standard mode: If no spawn points are available for a player to use they become an observer until a spawn point becomes available.

Extra / less time before starting to drown.

New modifiers/effects that can be applied/removed on players and NPCs via inventory items, and scripts, and custom (scripted) entities:.

New models for many weapons, ammo, and NPCs.

A gas mask can protect a player from nerve gas, but only lasts 2 minutes.

A bomb defuse kit has to be brought to a bomb to defuse it, or it explodes and you all die.

A key item must be carried by a player to a locked door, rather than it instantly becoming unlocked for rushers to wait by.New inventory system by using the new entity item_inventory, which is an item that a player holds on to for trigger rules and/or side-effects.The game play is now much more pure, with no 'kill monsters to proceed' gates.Many maps have been merged into a single map on a per-chapter basis to reduce map changes.Enabled survival game play mode with checkpoints, so players have to be more careful about staying alive and reviving fallen allies.All maps re-ported from scratch for Sven Co-op from Half-Life: Source.New build of all Half-Life maps for co-operative play.Mappers: See the engine changes section for more details and technical information.Maps can now be up to ~1,000x larger! (131,072 units away from position zero instead of just 4,096).

Gives us the opportunity to improve upon common limitations in the GoldSrc engine.

Sven Co-op now uses a customized GoldSrc engine under licence from Valve.

(workshop functionality to be included in a future release)

Includes use of the Steam game hub platform and community features.

Includes 3 packages: A game package for players, a tool package for dedicated server operators, and an SDK package for content developers.

Sven Co-op is now its own independent game distributed on Steam, free of charge.

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