Comment by crispweed

I'm working on a game arcade thing as a hobby project, themed around lockstep networking.

There's a website for this here: https://locksteparcade.com/

It's still very much a work in progress, with just two games. One is a version of the classic game "Lemmings". The other is a very minimal asteroids style inertial ship duel.

The games both use deterministic execution in lockstep across network participants, and provide interactive gameplay and smooth execution even if situations with up to quarter or half second lag times, and the methods used for this are then perhaps one interesting aspect of the project.

In each game, the local player sees their own controlled entities at current positions, and other player entities at historical positions.

In the lemmings game, the complication is that lemmings depend on their own world changes (e.g. they need to stand on a bridge piece they just built). So there is a kind of fork and merge mechanism that enables local and remote world changes to be eventually consistent.

In the inertial duel game, homing missiles have a deploy phase in which they transition between different update time frames, with exactly the same sequence of updates applied on each machine, but with these updates accelerated or slowed down to achieve the time frame synchronisation.

There is an offline part with a tutorial to go through for the lemmings clone, which gives a flavour of the thing. The networking part uses a dedicated server and is currently invite only, but if anyone is interested in trying this then please shout and I can send out server credentials..