I don't have the vast collection of game development skills needed to put good games on the cartridges, but luckily there are some fun linux games out there that fall under open source. Here I'll compile a list of games I'd like to see released for the Pi 400, in cartridge format. Even if I have to hand make the carts myself. I'll narrow it down to a single game, figure out the system requirements, any dependancies, and see if I can get it to work. The challenge will come in making sure the OS on the flash drive has everything needed to support the game. Ideally, there would be a very simple OS, and the game developers would just include any extra system software they need on the cart. Either way, I need to get a prototype working, and that means picking a game and just going with it. 

1) SuperTuxKart

This one looks fun and simple,  and has a decidedly Linux theme to it. I have to download and test it, check system requirements, document some things, and see if the game is fun. The fun is very important.

2) Hedgewars

This one looks like a ton of fun. Like the Worms games I used to play. It has network multiplayer, which is a feature I think would be implementing as well. 

3) 0 A.D

This one looks fantastic, and addictive. Apparently it's been around a very long time as well. It does raise a few concerns. First is if it will run on a Raspberry Pi 4 at all. I need to check that for all the games on the list, but I just want a list of fun games in general. Nextm it reminds me of updates. How does one go about safely updating cartridge games, or does one even bother at all? Locking a game into a known working version forever would be a safe way to go about it, but half the magic is in many of the updates. I'll think on that more later.

4) Doom

Of course this one has to be considered. It might end up being the first test game installed on a cart at this point. I'm not fan, but I know a lot of people are, and it might actually be pretty simple to get going. The main reason for putting it in the list is that it is known to run natively on the Raspberry Pi, and won't likely cause issues.

5) Duke Nukem 3D

Another native Linux game that can be played on the Pi. I should have known this one would pop up.

6) Minecraft Pi Edition

This one should have come to mind immediately, but I never really play Minecraft. This makes the most sense for a test program so far. It's well known, fun, easy to play, and is designed to be interfaced with Python for easy programming. I don't know if anyone would want this on a cartridge, but it would provide some interesting challenges, such as implementing Python on a cartridge and using it to interact with a game. 

Aside from some simple Pygames, that's all I've got so far. Moving onto OS research.