This is about an Apple II version of Portal, the cake acquisition simulator released in 2007 (not the similarly named contemporary Apple II game released in 1986). Note: this project is just for fun and is in no way endorsed by Valve, etc.
While attempting to travel to the future to get a copy of Portal 3. I accidentally traveled to alternate-1987 and obtained a copy of Portal 1 for the Apple II!
In actuality I originally just planned to do the end credits. But the Apple II high-res mode has the perfect Aperture Science orange and blue colors, and one thing led to another...
Also, before people get too excited, only two levels are implemented. It's not the entire game.
Official site
(140 KiB / 143.36 KB)
/ DSK image

90 /

2023-04-20 /

489b385bbcfe9ce7287b98ad7bd4c36f03f07618 /

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Architecture 

Other/Non-Mac architecture
Compatibility notes 
Emulating this? It could probably run under:
KEGS