Super 3D Noah's Ark was originally a NES & DOS game that was revamped for a 20th anniversary edition, and the new version includes a Linux port with an open source engine.
Grab your bibles as this is a Christian-themed game, but it's really just non-violent version of Wolfenstein 3D. So, try not to read into the religious thing too much and take it as it is.
You can find information on the source code here. It is based on the source code of ECWolf and updated to automatically load the assets for Super 3D Noah's Ark.
It's been a long journey. In just a few days, the ark doors will open and Noah, his family & the animals will be back on dry land. But the animals have become a bit restless and are out of their cages. Camels, giraffes, monkeys, kangaroos and more are wandering throughout the corridors of the ark. As Noah, it's your job to regain order & get the animals to sleep until you leave the ark. Your only tool to accomplish this is the food you brought aboard the ark. Can it be done? You bet! But how?
30 original levels.
6 feeders and 11 animal varieties.
Fully featured in game map.
Fully textured mapped environments.
Fast moving adventure for all ages!
20th Anniversary Edition
Runs natively on modern operating systems.
High resolution rendering.
Improved, modern style controls.
Option to play with SNES scale feeders.
Digitial manual with quiz guide.
Includes original DOS port.
Probably a good game for a younger audience.
Thanks c704710 for letting us know.