Managed to make it work.
Anything is possible mac os. Right click on the .app file (aka the game), click on 'Show Package Content', it will open a Finder window, browse to Content -> MacOS.
Browse the newest, top selling and discounted macOS supported games. The Terminal is an application inside all Macs. Be the indie wrestler mac os. It might be intimidating at first, because it's not as intuitive as the usual user interface, but it offers a lot of neat features, and you can use it do a lot of things that you would. With Puzzle—the first computer game specifically for a mouse—the Macintosh became the first computer with a game in its ROM, and it would remain a part of the Mac OS for the next ten years, until being replaced in 1994 with Jigsaw, a jigsaw puzzle game included as part of System 7.5.
Open the terminal and type 'cd ' (include the ' '), then drag & drop the file inside the Finder windows (it will be a file with a white icon called Karlson).
At this point you will see a kind of long command, erase the word 'Karlson' from the end of the command. (All of this is done to navigate to the same directory that Finder is in, but using the terminal.
Now type 'chmod +x Karlson'
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In case you see an error like 'permission denied' try to use 'sudo chmod +x Karlson', in this case you will be asked to enter the admin password.
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Now type ./Karlson and the game should start!
If it doesen't because of the Apple security thing, open 'System Preferences', click 'Security & Privacy', make sure to be in the 'General' tab. At the bottom of the window you will see a button saying something like 'Open Anyway', and red somewhere the name Karlson and the reason why it has been blocked (aka being downloaded from the Internet). Mama possum mac os.
Now the game opens and runs!
