Sublevel 1

Download and open the .zip file, and inside will be the 'Sublevel 1' application. Double click on the application to open it. Users may receive a popup saying: 

“Sublevel 1” cannot be opened because the developer cannot be verified

First of all, don't worry, the game will do no harm to your computer whatsoever. After your mind is at ease, click the 'cancel' option on the popup and head over to System Preferences. Click on the icon for 'Security and Privacy' and go to the 'General' section. On the bottom of this section you will see something that says:

“Sublevel 1” was blocked from use because it is not from an identified developer

Click the 'Open Anyway' button. When this is done, users who received the first popup will receive another popup saying:

macOS cannot verify the developer of “Sublevel 1 2”. Are you sure you want to open it?

Once again, don't worry, the game will do no harm to your computer whatsoever, so click the 'open' button. Viola, Sublevel 1 is now ready to play!