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Overview

Lockdown Protocol is a score-oriented platformer/shooter game with multiplayer support and built-in level editor. The game is available for Windows and Linux PCs.

You are a lone scientist in a research facility on automatic lockdown. Fight your way out, collect bigger weapons on the way and blast your enemies into pieces! Beat the high-scores in single player levels or challenge your friends to a multiplayer deathmatch!

Key features:

  • Smooth old-school shooter gameplay in platformer environments.
  • 25 single player levels to play and compete for the highest scores.
  • 7 multiplayer levels for brutal deathmatches.
  • Built-in level editor for creating your own levels.
  • Local split-screen and network multiplayer support.

Download a FREE DEMO or purchase the full version on itch.io (pay what you want):

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Screenshots

Videos

Gameplay trailer:

Development status

What's done

After nearly five years in development, the game is now ready. This does not mean that the development has stopped completely, I will still be fixing bugs and making minor improvements to existing features.

Known issues

Missing textures on Windows with some integrated Intel GPUs (at least HD4000). The workaround is to make sure you have DirectX 9 run-time installed and run the game with '--direct3d' command line option to use Direct3D renderer.

Gamepad support on Windows does not always work as reliably as it should. Sometimes gamepads are not detected by the game properly, even when Windows sees the device. Sometimes gamepad needs to be manually set as "preferred device" (in Windows game controller settings) to make it work. Sometimes disconnecting and reconnecting USB gamepads magically resolves the problem.

Downloads

You can download a free playable demo version of the game here:

Demo version 1.3.0 for Windows (installer)

Demo version 1.3.0 for Windows (zip)

Demo version 1.3.0 for 64-bit Linux

Demo version 1.3.0 for 32-bit Linux

The free version lets you play the first eight single player levels and one multiplayer level, rest of the levels can be previewed within time limitation. Level editor is fully enabled.

The full version is available on itch.io.

Frequently asked questions

How do I install the game?

If you downloaded the Windows installer executable, simply run it and it will install the game to your PC.

In other case, download the package version for your operating system, extract package contents to a folder of your choice and run the game from there. You can run provided install.sh or install.vbs script to create shortcuts in the system menu.

In Windows you must have Microsoft Visual C++ 2010 runtime installed (included in the installer).

Linux packages are known to work in latest stable releases of Ubuntu, Debian, OpenSUSE and Fedora distributions, but the game should work in many other distributions too. In some Linux distributions (for example Fedora) you may need to install libXaw, libGLU and libpng12 -packages from package manager.

What are the system requirements?

Here's my best guess on minimum hardware requirements:

  • 1.6Ghz processor
  • 1GB RAM
  • OpenGL 2.1 compatible 3D graphics card with at least 128MB of memory. Intel's HD3000 and later integrated GPUs work too (See known issues).
  • 100Mb of disk space available.

How can I share a level that I created?

The easiest way is to use the built-in level sharing mechanism. From Manage levels menu you can upload your levels online and browse levels uploaded by others. When uploading a level you can give a password, which allows you to update the shared level later on.

The levels can be copied manually too. All user created levels are stored in levels -subfolder inside the game data folder. If you want to give a level named foobar to your friend, you need to send him/her foobar.xml file from the levels -folder. Any new level files copied to levels -folder will automatically show up in the game next time the game is run.

The location of user data folder depends on the operating system, it is typically one of these (Linux, Windows XP and Windows Vista/7/8 respectively): /home/<username>/.lockdownprotocol C:\Documents and Settings\<username>\Application Data\lockdownprotocol C:\Users\<username>\AppData\Roaming\lockdownprotocol

If the level to be shared is a multiplayer level, there is one more option. If you host a multiplayer match with that level and your friend joins the match, the level will be automatically transferred.

Why are there no online multiplayer matches?

First of all, there are no central/dedicated game servers. Any player can host a game and it will appear in the match list so that other players can join the match. Note that you must enter an online name for the match, otherwise it is assumed to be a local match and is not listed online. Unfortunately the user base is currently so small that there are rarely any matches to join.

The solution is to host your own match and ask your friends to join.

Why is the network multiplayer gameplay laggy/jerky?

Network gameplay requires a fairly good connection between the players. If the players are halfway around the world from each other, you will likely experience lag/jerkiness in player movement, even if everyone has a good connection to the Internet.

The game does its best to compensate for connection latency, but as the latency (and especially latency variation) gets higher, movement on client will get jerky and lagged. The latency compensation is limited to 200ms, but for reasonably smooth gameplay you will need a connection with less than 100ms latency (200ms RTT/ping) and low latency variance.

Why can't other players join my hosted network multiplayer match?

If the match is visible to others, but connecting to it timeouts, the most common reason is network address translation (NAT) done by your router/modem. If the computer acting as server is behind a NAT (not directly connected to internet), the router might be blocking access to server. There are four standard types of NAT and the game should be able to deal with three of those by using so called NAT punch-through.

If your router happens to implement the fourth type, symmetric NAT, then only option is to change your router settings. The router must be configured so that traffic to and from the UDP port on server (26001 by default) gets through and port number on outgoing traffic from that port is preserved. Unfortunately this is not always possible.

There are some good articles on think-like-a-computer.com that explain the different NAT types and the problems with the symmetric NAT.

Why is this not on Steam?

The most important reason is that the game has not gotten much publicity so far, so its changes of getting through Greenlight are not that good. I'm not a big fan of Steam DRM either. If I see enough interest in the game, I will reconsider submitting it to Greenlight.

If the game is some day available on Steam, people who have already purchased it will receive Steam keys.

Will there be a version for OSX?

Most of the game code is platform independent and all dependencies are available for OSX too so it could be done, but currently I haven't got the hardware or enough time to set up and maintain yet another platform version.

Fortunately the Windows version has been reported to work well on OSX using Wine. You will also need Microsoft Visual C++ 2010 installed.