Welcome to PCKF, OceanMadman! It's great to hear that you're interested in trying out Commander Keen! I'm sure it'll be a great experience you won't regret!
Of all the Keen episodes,
Keen 1,
Keen 4, and
Keen Dreams can be downloaded without any charge, since they're shareware. The
Keen 6 demo is also shareware. I personally recommended Keen 4; it's a common fan-favorite here! It's got the most visual variety, lots of quirky monsters, and many cool secrets that are waiting to be discovered! Keen 1 is also pretty great, if you can get over the unusual jumping physics and basic graphics. In each of those links I just posted, you can find the download link in the bottom of the infobox that's by the right.
If you're running a modern computer, you're going to need
DOSBox to run these games. Once you have installed a Keen game, you must run the executable file (e.g. for Keen 4 it's KEEN4E.EXE). In Windows, you can just drag-and-drop the Keen exe file into the DOSBox exe file. I don't know much about Linux, but if that's what you're using, there's a
tutorial on KeenWiki that might really help you.
We do have a few Keen source ports that can run without DOSBox, such as
Commander Genius and
Omnispeak, if you'd rather try those. I personally recommended playing the games on DOSBox if you can, however.
If you really enjoy the shareware episodes and would like to play the other games (trust me, all 7 DOS episodes are totally worth playing!), you can get episodes 1-5 for only five bucks on
GOG.com. Episode 6 is, unfortunately, not available for sale due to rights issues, so the only legal way to get is through second-hand purchases.
Hope this response helps! If you have any more questions, feel free to ask. Happy Keening!
