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Comment by Animats | Hacker News Reader

OpenRCT2 requires original files of RollerCoaster Tycoon 2 to play.

It's the engine without the assets. Kind of like Open Rails, which is an open source engine for Microsoft Train Simulator content. That's been out for a while, and now others are writing content for it.

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The same approach was used for OpenTTD, which is a re-implementation and extension of Transport Tycoon Deluxe, one of the other Chris Sawyer classics. When finally all graphics and sounds had been recreated, version 1.0.0 was released in 2010. Before that the original asset files were required to play the game.

https://www.openttd.org/

Or OpenMW which does the same thing for Morrowind (The Elder Scrolls 3). The main difference here being it runs on Linux natively and fixes tons of engine bugs that never were. They even have their own map editor for Morrowind which is just awesome.

Engines are easier compared to the assets. You only need programmers writing code (hard but easier than finding teams to work on assets)

$10 regular price is well spent.

http://store.steampowered.com/app/285330/RollerCoaster_Tycoo...

https://www.gog.com/game/rollercoaster_tycoon_2

If you want to buy the game, it regularly goes on sale for less than $2 on GOG

OpenTTD was like this as well for quite a while, until they had enough assets to include it in the base game.

I believe there is a Doom variant with the same requirements. It requires the image and sound files.

I am not a gamer so I can't opine on the quality.

GZDoom! It's amazing. By far my favorite game. You just need the original Doom .wad files.

https://zdoom.org/downloads

Could have sworn that is the case with the various Quake 1 engines out there, that are based on the source ID released.

All the Id Software games with engines released have that requirement. The open source game binaries basically act as drop-in replacements for the original binaries, a lot of the time.

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