I was developing games on MSX/MSX2 about 40 years ago. It was already a fight with hardware resources, but the Apple II was an even stricter environment. Impressive work. Below is a quick comparison for those unfamiliar with the specs: Macintosh (1989): 16-40MHz 68000, 1-4MB RAM, hardware acceleration, QuickDraw, non-blocking sound Apple II (1979): 1MHz 6502, 64KB RAM, no hardware multiply/divide, race against CRT beam (4550 cycles), blocking sound only * 10-year age gap, 16-40x slower CPU, 16-64x less RAM

Shufflepuck Cafe ran on the original Macs, which were 8MHz and had between 128K and 512k of RAM. (I never had access to a 128K machine and don't know if Shufflepuck worked on those.) This is still an incredible achievement of course! But the types of Macs that ran at 16MHz with 1MB RAM were probably incompatible with the original Shufflepuck as it was coded with the original Mac screen resolution firmly embedded into the design.