Posted November 16, 2017
josh72718: No offence taken, friend. Without steam? Do you mean like this
http://www.minijuegos.com/juego/sonic-cd
(it's in spanish, my mother tongue)
MarkoH01: Its simple. Normally steam games require you to have steam running to download AND to run the game. If you run a normal steam game by clicking on the executable without having steam running in the background you will get an error message. So you will have to start steam and log in to your account. However there are some games for which you don't even need to have steam installed after you have downloaded them. You can download the game, store the files wherever you want and then uninstall steam completely. http://www.minijuegos.com/juego/sonic-cd
(it's in spanish, my mother tongue)
Long story short: Don't start the steam client, search for the game executable and double click it. If the game is starting and saving/loading you can be pretty sure that it belongs on this list. If you want to be 100% sure try to copy the files of the game to another PC or run them in a virtual PC.